if sec4A=cosec(A-18),where 4A is an acute angle, find the value of A
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Answer:
A = 21.6°
Step-by-step explanation:
We know,
secθ = cos(90-θ)
sec4A = cosec(A - 18) ————(i)
sec4A = cosec(90 - 4A) ————-(ii)
From (i) and (ii)
cosec(A - 18) = cosec(90 - 4A)
A - 18 = 90 - 4A
5A = 108
A = 21.6°
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