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Question Number 148674 by bemath last updated on 30/Jul/21

 Find max & min value of   (1)  f(x)=sin^3 x (√(1+cos^2 x)) +cos^3 x(√(1+sin^2 x)) .  (2) f(x)=sin x (√(1+cos^2 x)) +cos x (√(1+sin^2 x)) .   x ∈ R

$$\:\mathrm{Find}\:\mathrm{max}\:\&\:\mathrm{min}\:\mathrm{value}\:\mathrm{of} \\ $$ $$\:\left(\mathrm{1}\right)\:\:\mathrm{f}\left(\mathrm{x}\right)=\mathrm{sin}\:^{\mathrm{3}} \mathrm{x}\:\sqrt{\mathrm{1}+\mathrm{cos}\:^{\mathrm{2}} \mathrm{x}}\:+\mathrm{cos}\:^{\mathrm{3}} \mathrm{x}\sqrt{\mathrm{1}+\mathrm{sin}\:^{\mathrm{2}} \mathrm{x}}\:. \\ $$ $$\left(\mathrm{2}\right)\:\mathrm{f}\left(\mathrm{x}\right)=\mathrm{sin}\:\mathrm{x}\:\sqrt{\mathrm{1}+\mathrm{cos}\:^{\mathrm{2}} \mathrm{x}}\:+\mathrm{cos}\:\mathrm{x}\:\sqrt{\mathrm{1}+\mathrm{sin}\:^{\mathrm{2}} \mathrm{x}}\:. \\ $$ $$\:\mathrm{x}\:\in\:\mathbb{R}\: \\ $$

Answered by EDWIN88 last updated on 30/Jul/21

Commented byEDWIN88 last updated on 30/Jul/21

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