Question

sin^2x+2sinx+1=0

Answer 1

What is a^2+2ab+b^2?

Answer 2

If you substitute \(u = \sin x\) the problem may seem rather more familiar:

\[u^2 + 2u + 1 = 0\]
Solve that, then replace \(u\) in the solutions with \(\sin x\) and solve again for the value(s) of \(x\).