Question

упростите выражение (1+sin a)/(2cos a+sin2 a)

Answer 1

Решение:
$frac{1+sin alpha }{2cos alpha +sin2 alpha } = frac{1+sin alpha }{2cos alpha +2sin alpha cos alpha } = frac{1+sin alpha }{2cos alpha (1+sin alpha ) } = frac{1}{2cos alpha }$