15. Find the value of theta if sec4theta = cosec (theta - 20°), where 4theta and theta-20° are acute angles.
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ANSWER: A=22
EXPLAINATION:
sin(A−20
0
)=cos(4A)
sin(A−20
0
)=sin(90
0
−4A)
Hence
A−20
0
=90
0
−4A
5A=110
0
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