se tg x = raiz de 5 entao sen2²x é igual a?

luisa-cardosoluisa-cardoso
in Science & Mathematics

A) 1/6

B) 1/5

C) raiz de 3/4

D) 3/5

E) 5/6

Comments

  • einsteineinstein

    Se for sen² x=??

    tg x =senx/cos x= √5

    senx =cos x*√5

    sen²x=5cos²x

    sen²x+cos²x=1

    5cos²x+cos²x=1

    cos²x=1/6

    sen²x=5cos²x=5/6

    Letra E

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