Question

Fast pls pls pls pls pls

Answer 1

1. Sina+cosa=1/3

(Sina+cosa)²=sin²a+cos²a+2 sina cosa=1+sin2a

(1/3)²=1+sin2a

Sin2a=1/9-1=-8/9

Raspuns: sin2a=-8/9

2. In cadranul 2, sina=3/5. Cosa este negativ.

Cos²a=1-sin²a=1-(3/5)²=1-9/25=16/25

Deci cosa=-4/5.

Tga=sina/cosa=(3/5)/(-4/5)=-3/4.

Raspuns: tga=-3/4