Question

(sinA-B)^2=  как это решить?

Answer 1

4(sin(a) - b2)^2 = 4*(sin^2(a) - 2*sin(a) * (b/2) + b^2 / 4) = 4*(sin^2(a) - b*sin(a) + 0.25b^2) = 4sin^2(a) - 4b*sin(a) + b^2 = (2sin(a))^2 - 2*(2sin(a))*b + b^2 = (2sin(a) - b)^2