СРОЧНО! упростить : (sin a+2cos a)^2+4sin a *cos a

Question

СРОЧНО!
упростить : (sin a+2cos a)^2+4sin a *cos a

Answer 1

(sin a+2cos a)^2 + 4sin a * cos a
(sin a)^2+4sin a*cos a+(cos a)^2+4sin a*cos a
1+2sin2a + 2sin2a = 1+4sin2a