Question

if sin theta =3/5 where π/2<theta <π find value of cos 2theta​

Answer 1

Answer:

cos 2θ =  0.2756...

Step-by-step explanation:

Since, sin θ =3/5

So, θ = 143°

So, cos 2θ = cos 286° = cos 106° =  0.2756...

Hope this helps.....