Вычислите:(1-sin^2*22°30')/(2cos^2*15°-1)

Question

Вычислите:
(1-sin^2*22°30')/(2cos^2*15°-1)

Answer 1

=(1-sin^2(45)/ cos30 = cos^2(45)/cos30=1/2 :sgrt3/2=1/2 * 2/sgrt3=1/sgrt3.