Question

If a = 3 Cos2 ; and b = 3Sin2 +1; then find a+b​

Answer 1

Given, x=2sin

2

θ,y=2cos

2

θ+1

To find: (x+y)

x+y=2sin

2

θ+2cos 2 θ+1

=2(sin 2 θ+cos 2 θ)+1 .....(As sin 2θ+cos 2 θ=1)

=2+1

=3.............