Question

please solve it GUYS!!!!
example 10

Answer 1

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Answer 2

$\huge\underline\mathfrak{Solution:- }$
$<i><b>$

sin 3A = cos 3A
cos(90° - 3A ) = cos (A - 26 ).

( 90- 3A ) = A - 26

90+ 26 = 3A + A

116 = 4A

A = $\frac{116}{4 } = 29$

$\huge\mathfrak\green{thanks}$ .