Question

Вычислить: 5sin^2a+5cos^2a-10

Answer 1

10sin²a=3sin²a=0,3cos²a=1-0,3=0,75sin²a+2,2-cos²a=5*0,3+2,2-0,7=1,5+2,2-0,7=2,7-0,7=2

Answer 2

$5sin^2(a)+5cos^2(a)-10 =0 ~~~~~~~~~~~~ | sin^2x+cos^2x=1| \\ 5-10 = -5$