Question
If sin5A = cos(2A+20°), then what is the value of A?
Given that 5A is an acute angle.Solution
Always remember that sin & cos are compliment to each other So sin ɵ = cos( 90-ɵ) So it is given that sin5A = cos(2A+20°) Hence 5A + 2A + 20° = 90° So 7A + 20° = 90° or 7A =90°-20° = 70° or A = 
= 10°
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