Question

Help me 😭

Answer 1

4:

c: \(C=\left[cosx+sinx\right]^2+\left[-cos\left(\dfrac{pi}{2}-x\right)+cos\left(-x\right)\right]^2\)

\(=1+sin2x+\left[-sinx+cosx\right]^2\)

=1+sin2x+1-sin2x

=2