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Question

Mathematics Question on integral

∫cos 5x+cos 4x1−2cos3x\int\frac {cos \, 5x + cos \, 4x}{1-2cos3x}dx is equal to sin2x2+sin x+c\frac {sin2x} {2}+sin\,x+c

A

−sin2x2−sin x+c\frac {-sin2x} {2}-sin\,x+c

B

−sin2x2−sin x+c-\frac {sin2x} {2}-sin\,x+c

C

sin2x2−sin x+c\frac {sin2x} {2}-sin\,x+c

D

−sin2x2+sin x+c\frac- {sin2x} {2}+sin\,x+c

Answer

−sin2x2−sin x+c-\frac {sin2x} {2}-sin\,x+c

Explanation

Solution

Answer (b) −sin2x2−sin x+c-\frac {sin2x} {2}-sin\,x+c