please help me. it's urgent....
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Answer:
1. 3cosθ=5sinθ
cosθ=(
3
5
)sinθ
cos
2
θ=(
3
5
)
2
sin
2
θ
1−sin
2
θ=(
9
25
)sin
2
θ
⇒sin
2
θ=
34
9
∴sinθ=
34
3
cos
2
θ=1−sin
2
θ=1−
34
9
=
34
25
∴cosθ=
34
5
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