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Let f(x) = log (sin x+ cos x), x in x (-...

Let f(x) = log (sin x+ cos x), x in x `(-pi/4,(3pi)/(4))` . Then f is stricly increasing in the interval

A

`(-pi/4,pi/4)`

B

`(0,(3pi)/8)`

C

`(-pi/4,pi/2)`

D

`(pi/2,(3pi)/4)`

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The correct Answer is:
A
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TARGET PUBLICATION-APPLICATIONS OF DERIVATIVES-COMPETITIVE THINKING
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