Question

If x= 2sin2a and y= 2cos2a+1 ,then find the value of x+y

Answer 1

Answer:

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

2

θ+cos

2

θ=1)

=2+1

=3