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Which of the following functions are strictly decreasing on(0,π/2) ?

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asked Jan 20, 2018 in Mathematics by sforrest072 (157,439 points) ● 61 ● 410 ● 949
edited Jan 20, 2018 by sforrest072
Which of the following functions are strictly decreasing on(0,π/2) ?
(A) cos x  (B) cos 2x  (C) cos 3x   (D) tan x

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answered Jan 20, 2018 by mdsamim (213,225 points) ● 5 ● 10 ● 15
selected Jan 20, 2018 by sforrest072
 
Best answer

Therefore, functions cos x and cos 2x are strictly decreasing in(0,π/2).

Hence, the correct answers are A and B.

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