Question

Which of them isn’t equal??

Answer 1

`a)\ \sin x\cos x\\\\b)\ (1)/(2)\sin(2x)=(1)/(2)\cdot2\sin x\cos x=\sin x\cos x\\\\c)\ \sin^2x\cot^2x=\sin^2x\cdot(\cos^2x)/(\sin^2x)=\cos^2x\\\\d)\ \tan x\cos^2x=(\sin x)/(\cos x)\cdot\cos^2x=\sin x\cos x\\\\Answer:\ c).`