sec A =√2 .find . 3cotA+2 sinA tan A - cos 2 A
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Answer: secA=
2
secA=sec45
A=45
∘
Now,
tan
2
A−cos
2
A
3cot
2
A+2sin
2
A
=
tan
2
45−cos
2
45
3cot
2
45+2sin
2
45
=
(1)
2
−(
2
1
)
2
3(1)
2
+2(
2
1
)
2
=
2
1
3+1
= 8
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