Question

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Answer 1

you can use the identity : \(\large \sin^2 \theta+\cos^2 \theta =1\)

Answer 2

remember that sin theta is positive in 2nd quadrant ....

Answer 3

how do i identify what sin^2 θ is?

Answer 4

you have cos theta, right ?
calculate cos^2 theta =... ?
then using that formula i gave find sin^2 theta=...?

Answer 5

what u get ?

Answer 6

144/169...?

Answer 7

that is cos^2 theta and is correct :)
now what about sin^2 theta , using that formula ? could u find ?

Answer 8

did u get the answer ?