Question

Cós x=raiz 2/2 , com pi/2

Answer 1

cos x = \/2/2 sec x + cosec x =  1/cos x + 1/sen x = sen² + cos² = 1 sen² + (\/2/2)² = 1 sen² + 2/4 = 1 sen² = 1 - 2/4 sen² = 2/4 sen² = 1/2 sen = \/(1/2)
sen = 1 / \/2
sen = \/2/2
sec x + cosec x =  1/cos x + 1/sen x =  1/ \/2/2 + 1/ \/2/2 =  
2 / \/2 + 2 / \/2 = 4 / \/2 = 4 \/2/2 = 2\/2