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Author: Tinku Tara

If-sin-sin-2-1-sin-4-and-sin-5-are-in-AP-where-pi-lt-lt-pi-then-lies-in-the-interval-

Question Number 25371 by ppriyanshupatel200252@gmail.co last updated on 09/Dec/17 $$\mathrm{If}\:\mathrm{sin}\:\alpha,\:\mathrm{sin}^{\mathrm{2}} \alpha,\:\mathrm{1},\:\mathrm{sin}^{\mathrm{4}} \alpha\:\mathrm{and}\:\mathrm{sin}^{\mathrm{5}} \alpha\:\mathrm{are}\:\mathrm{in}\:\mathrm{AP}, \\ $$$$\mathrm{where}\:\:\:−\pi<\alpha\:<\:\pi,\:\mathrm{then}\:\alpha\:\mathrm{lies}\:\mathrm{in}\:\mathrm{the} \\ $$$$\mathrm{interval} \\ $$ Terms of Service Privacy Policy Contact:…

Three-dice-are-rolled-The-number-of-possible-outcomes-in-which-at-least-one-die-shows-5-is-

Question Number 25334 by arvindbrar26068@gmail.com last updated on 08/Dec/17 $$\mathrm{Three}\:\mathrm{dice}\:\mathrm{are}\:\mathrm{rolled}.\:\mathrm{The}\:\mathrm{number}\:\mathrm{of} \\ $$$$\mathrm{possible}\:\mathrm{outcomes}\:\mathrm{in}\:\mathrm{which}\:\mathrm{at}\:\mathrm{least} \\ $$$$\mathrm{one}\:\mathrm{die}\:\mathrm{shows}\:\mathrm{5}\:\mathrm{is} \\ $$ Answered by ajfour last updated on 08/Dec/17 $${coeff}.\:{of}\:{x}^{\mathrm{1}} +{coeff}.\:{of}\:{x}^{\mathrm{2}}…

X-and-Y-can-do-a-work-in-30-days-and-60-days-respectively-If-they-work-on-alternate-days-beginning-with-X-in-how-many-days-will-the-work-be-completed-

Question Number 25295 by Mr eaay last updated on 07/Dec/17 $$\mathrm{X}\:\mathrm{and}\:\mathrm{Y}\:\mathrm{can}\:\mathrm{do}\:\mathrm{a}\:\mathrm{work}\:\mathrm{in}\:\mathrm{30}\:\mathrm{days}\:\mathrm{and} \\ $$$$\mathrm{60}\:\mathrm{days}\:\mathrm{respectively}.\:\mathrm{If}\:\mathrm{they}\:\mathrm{work}\:\mathrm{on} \\ $$$$\mathrm{alternate}\:\mathrm{days}\:\mathrm{beginning}\:\mathrm{with}\:\mathrm{X},\:\mathrm{in} \\ $$$$\mathrm{how}\:\mathrm{many}\:\mathrm{days}\:\mathrm{will}\:\mathrm{the}\:\mathrm{work}\:\mathrm{be} \\ $$$$\mathrm{completed}? \\ $$ Answered by mrW1 last…

If-the-roots-of-the-quadratic-equation-x-2-3x-304-0-are-and-then-the-quadratic-equation-with-roots-3-and-3-is-

Question Number 25172 by yuvasuprith07@gmail.com last updated on 05/Dec/17 $$\mathrm{If}\:\mathrm{the}\:\mathrm{roots}\:\mathrm{of}\:\mathrm{the}\:\mathrm{quadratic}\:\:\mathrm{equation}\: \\ $$$${x}^{\mathrm{2}} −\mathrm{3}{x}−\mathrm{304}=\mathrm{0}\:\mathrm{are}\:\alpha\:\mathrm{and}\:\beta,\:\mathrm{then}\:\mathrm{the} \\ $$$$\mathrm{quadratic}\:\mathrm{equation}\:\mathrm{with}\:\mathrm{roots}\:\mathrm{3}\alpha\:\mathrm{and} \\ $$$$\mathrm{3}\beta\:\mathrm{is} \\ $$ Answered by ajfour last updated on…

The-value-of-sin-pi-14-sin-3pi-14-sin-5pi-14-is-

Question Number 90628 by Josephbaraka@gmail.com last updated on 25/Apr/20 $$\mathrm{The}\:\mathrm{value}\:\mathrm{of}\:\mathrm{sin}\:\frac{\pi}{\mathrm{14}}\:\mathrm{sin}\:\frac{\mathrm{3}\pi}{\mathrm{14}}\:\mathrm{sin}\:\frac{\mathrm{5}\pi}{\mathrm{14}}\:\:\mathrm{is} \\ $$ Commented by jagoll last updated on 25/Apr/20 $${x}\:=\:\frac{\pi}{\mathrm{14}}\:\Rightarrow\mathrm{7}{x}\:=\:\frac{\pi}{\mathrm{2}} \\ $$$${w}\:=\:\mathrm{sin}\:{x}\:\mathrm{sin}\:\mathrm{3}{x}\:\mathrm{sin}\:\mathrm{5}{x} \\ $$$$\mathrm{2}{w}\:\mathrm{cos}\:{x}\:=\:\mathrm{sin}\:\mathrm{2}{x}\:\mathrm{sin}\:\mathrm{5}{x}\:\mathrm{sin}\:\mathrm{3}{x} \\…

If-sin-1-1-x-2-sin-1-x-pi-2-then-x-

Question Number 90629 by Josephbaraka@gmail.com last updated on 25/Apr/20 $$\mathrm{If}\:\:\:\mathrm{sin}^{−\mathrm{1}} \left(\mathrm{1}−{x}\right)−\mathrm{2}\:\mathrm{sin}^{−\mathrm{1}} {x}\:=\:\frac{\pi}{\mathrm{2}},\:\mathrm{then}\:{x}= \\ $$ Commented by jagoll last updated on 25/Apr/20 $${let}\:\mathrm{sin}^{−\mathrm{1}} \left(\mathrm{1}−{x}\right)\:=\:{y} \\ $$$$\mathrm{1}−{x}\:=\:\mathrm{sin}\:{y}\:\Rightarrow{x}\:=\:\mathrm{1}−\mathrm{sin}\:{y}…

A-man-can-row-6-km-h-in-still-water-When-the-river-is-running-at-1-2-km-h-it-takes-him-1-hour-to-row-to-a-place-and-back-How-far-is-the-place-

Question Number 25076 by Mr easy last updated on 03/Dec/17 $$\mathrm{A}\:\mathrm{man}\:\mathrm{can}\:\mathrm{row}\:\mathrm{6}\:\mathrm{km}/\mathrm{h}\:\mathrm{in}\:\mathrm{still}\:\mathrm{water}. \\ $$$$\mathrm{When}\:\mathrm{the}\:\mathrm{river}\:\mathrm{is}\:\mathrm{running}\:\mathrm{at}\:\mathrm{1}.\mathrm{2}\:\mathrm{km}/\mathrm{h}, \\ $$$$\left.\mathrm{it}\:\mathrm{takes}\right]\mathrm{him}\:\mathrm{1}\:\mathrm{hour}\:\mathrm{to}\:\mathrm{row}\:\mathrm{to}\:\mathrm{a}\:\mathrm{place}\: \\ $$$$\mathrm{and}\:\mathrm{back}.\:\mathrm{How}\:\mathrm{far}\:\mathrm{is}\:\mathrm{the}\:\mathrm{place}? \\ $$ Answered by mrW1 last updated on…

Let-z-1-and-z-2-be-two-roots-of-the-equation-z-2-az-b-0-z-being-complex-Further-assume-that-the-origin-z-1-and-z-2-form-an-equilateral-triangle-Then-

Question Number 25075 by Mr easy last updated on 03/Dec/17 $$\mathrm{Let}\:{z}_{\mathrm{1}} \mathrm{and}\:{z}_{\mathrm{2}} \:\mathrm{be}\:\mathrm{two}\:\mathrm{roots}\:\mathrm{of}\:\mathrm{the}\:\mathrm{equation} \\ $$$${z}^{\mathrm{2}} +{az}+{b}=\mathrm{0},\:{z}\:\mathrm{being}\:\mathrm{complex}.\:\mathrm{Further} \\ $$$$\mathrm{assume}\:\mathrm{that}\:\mathrm{the}\:\mathrm{origin},\:{z}_{\mathrm{1}} \:\mathrm{and}\:{z}_{\mathrm{2}} \:\mathrm{form} \\ $$$$\mathrm{an}\:\mathrm{equilateral}\:\mathrm{triangle}.\:\mathrm{Then}, \\ $$ Answered…

In-a-triangle-ABC-a-b-cos-C-c-cos-B-

Question Number 90535 by 1223 last updated on 24/Apr/20 $$\mathrm{In}\:\mathrm{a}\:\mathrm{triangle}\:{ABC},\:{a}\left({b}\:\mathrm{cos}\:{C}−{c}\:\mathrm{cos}\:{B}\right)= \\ $$ Answered by $@ty@m123 last updated on 24/Apr/20 $${a}\left({b}×\frac{{a}^{\mathrm{2}} +{b}^{\mathrm{2}} −{c}^{\mathrm{2}} }{\mathrm{2}{ab}}−{c}×\frac{{c}^{\mathrm{2}} +{a}^{\mathrm{2}} −{b}^{\mathrm{2}}…