Question

Помогите упростить !!!!!

Answer 1

а) 1-sin²α=cos²α
б)ctg²α+1=1/sin²α
в)sin²α(sin²α+cos²α)=sin²α

Answer 2

1)...=1-sin²a=cos²a
2)...=ctga:1/ctga +1=ctg²a+1=1/sin²a
3)...=sin²a(sin²a+cos²a)=sin²a*1=sin²a