3 sin(пи-а)сos(пи/2-а)+3sin^2(пи/2-а)=?

Question

3 sin(пи-а)сos(пи/2-а)+3sin^2(пи/2-а)=?

Answer 1

3 sin(π-а)сos(π/2-а)+3sin^2(π/2-а)= 3 sinа sinа+3cos^2а=3 sin^2а+3cos^2а=3