Question and Answers Forum

All Questions      Topic List

Trigonometry Questions

Previous in All Question      Next in All Question      

Previous in Trigonometry      Next in Trigonometry      

Question Number 9414 by Rohit kumar last updated on 06/Dec/16

tanA+cot=A= 2cosec2A

$${tanA}+{cot}={A}=\:\mathrm{2}{cosec}\mathrm{2}{A} \\ $$

Answered by ridwan balatif last updated on 06/Dec/16

tanA+cotA=2cosec2A  ((sinA)/(cosA))+((cosA)/(sinA))=2cosec2A  ((sin^2 A+cos^2 A)/(cosA×sinA))=2cosec2A  (1/((1/2)×(2cosA×sinA)))=2cosec2A  (2/(sin2A))=2cosec2A  2cosec2A=2cosec2A

$$\mathrm{tanA}+\mathrm{cotA}=\mathrm{2cosec2A} \\ $$$$\frac{\mathrm{sinA}}{\mathrm{cosA}}+\frac{\mathrm{cosA}}{\mathrm{sinA}}=\mathrm{2cosec2A} \\ $$$$\frac{\mathrm{sin}^{\mathrm{2}} \mathrm{A}+\mathrm{cos}^{\mathrm{2}} \mathrm{A}}{\mathrm{cosA}×\mathrm{sinA}}=\mathrm{2cosec2A} \\ $$$$\frac{\mathrm{1}}{\frac{\mathrm{1}}{\mathrm{2}}×\left(\mathrm{2cosA}×\mathrm{sinA}\right)}=\mathrm{2cosec2A} \\ $$$$\frac{\mathrm{2}}{\mathrm{sin2A}}=\mathrm{2cosec2A} \\ $$$$\mathrm{2cosec2A}=\mathrm{2cosec2A} \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com