Sendo senx= 12/13 com 0< x < 90, então o valor de sen2x é igual a?.... Pergunta de ideia deLucasTomazChaves

LucasTomazChaves @LucasTomazChaves

January 2020 1 39 Report

Sendo senx= 12/13 com 0< x < 90, então o valor de sen2x é igual a?

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spnatwn Sen2x= 2*senx*cosx

sen²x+cos²x=1
(12/13)²+cos²x=1
cos²x=1-144/169=25/169
cosx=5/13

sen2x=2*12/13*5/13
sen2x=120/169

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