Question

Seja o ângulo agudo x tal que Senx=24/25 determine Cos x

Answer 1

Sen x = 24/25........................cos x = ?

Pela relação fundamental: sen² x + cos² x = 1

................................................. cos² x = 1 - sen² x

................................................. cos² x = 1 - (24/25)²

................................................. cos² x = 1 - 576/625

................................................. cos² x = 49/625

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, cos² x = (7/25)²

................................................. cos x = 7/25.........( resposta)