Question

find the value of A when cos 2A = sin3A

Answer 1

2A+3A=90
5A=90
A=18.........

Answer 2

$\bf{ANSWER:-}$

cos2A=sin3A
sin[90°-2A]=sin3A [cosA=sin(90°-A)]
90-2A=3A
90°=5A
A=90/5°
A=18°

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