Question

if cos theta =- 3/5 and theta lies in the third quadrant then value of sin theta​

Answer 1

Answer:

Step-by-step explanation:

cos theta=adj/hyp=-3/5

opp=√5^2-3^2

    =√25-9

    =√16

 =±4

sin theta=opp/hyp

             =4/5

since theta lies in the third quadrant,sin theta is negative

∴sin theta=-4/5