Question

7. If sinA + sinA^2 =1, then the value of the expression (COS^2A + COS^4 A) is:
a.1
b.1/2
c.2
d.3
ans with procedure pls​

Answer 1

Step-by-step explanation:

sinA =1-sinA^2

=cos^2

cos^2A+cos^4A = cos^2A(1+sin^2A)

=sinA × (1+ sinA) = sinA + sin^2A =1