Question

(cos40st./sin50st.) - (sin^2 38st. + sin^2 52 st.)

Answer 1

(cos40st./sin50st.) - (sin^2 38st. + sin^2 52 st.)

(cos40st./cos40st.) - (sin^2 38st. + cos^2 38 st.)

1-1=0

wzory:

sinα=cos(90-α)