Question

If,SinA+Sin^A=1,then Cos^A+Cos⁴=?

Answer 1

SinA+Sin^2A=1

SinA=1-Sin^2A

SinA=Cos^A..........according to identity that 1- Sin^2A=Cos^2A

So putting this values in Cos^2A+Cos^4A we get

SinA+Sin^2A=1. Given

So answer is 1