If sec 4A = cosec (A – 20°), where 4A is an acute angle, find the value of A.
NCERT Class X
Mathematics - Mathematics
Chapter _INTRODUCTION TO
TRIGONOMETRY
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sec 4A = cosec(A-20°)
or sec 4A = cosec (90° - (A-20°))
or sec 4A = sec(110° - A)
or 4A = 110° - A
or 5A = 110°
or, A = 22°
or sec 4A = cosec (90° - (A-20°))
or sec 4A = sec(110° - A)
or 4A = 110° - A
or 5A = 110°
or, A = 22°
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