Question

how do i simplify 3 cos^2 x + 3 cos^2 x tan^2 x

Answer 1

\[\tan^2x=\frac{\sin^2x}{\cos^2x}\]
so
\[\cos^2x\tan^2x=\sin^2x\]
\[3\cos^2x+3\sin^2x=3\left(\cos^2x+\sin^2x\right)=\cdots\]

Answer 2

and remember \[\cos^{2}x + \sin^{2}x = 1\]
:)

Answer 3

thanks guys!

Answer 4

yw

Answer 5

3