If 4sin 0-1=0 and o is acute angle then find
3) cos Otsing in ca²0+ taño 1) cos 20 iu) sin 30
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Answer:
θ
Answer
4sin
2
θ−1=0
4sin
2
θ=1
sinθ=
2
1
(Neglecting the negative value, since θ<90
∘
)
sinθ=sin30
∘
θ=30
∘
Now, cos
2
θ+tan
2
θ
= cos
2
30
∘
+tan
2
30
∘
= (
2
3
)
2
+(
3
1
)
2
=
4
3
+
3
1
=
12
9+4
=
12
13
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