20. If cosecA = sec(A -10%), where A is an acute angle, find the value of A.
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0
Answer:
sec 4A = cosec (A - 20°)
s
e
c
4
A
=
c
o
s
e
c
(
A
−
15
∘
)
So,
s
e
c
4
A
=
s
e
c
(
90
−
(
A
−
15
∘
)
)
So,
s
e
c
4
A
=
s
e
c
(
75
∘
−
A
)
4
A
=
75
∘
−
A
5
A
=
75
∘
A
=
75
5
=
13
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