Question
The Value of (sin38˚)/(cos52˚) + (cos12˚)/(sin78˚) -
4cos²60˚ isSolution
(sin38˚)/(cos52˚)+ (cos12˚)/(sin78˚)- 4cos²60˚ (cos(90-38)˚)/(cos52˚)+ (sin(90-12)˚)/(sin78˚)- 4cos²60˚ (cos52˚)/(cos52˚)+ (sin78˚)/(sin78˚)- 4cos²60˚ ⇒1 + 1 - 4×(1/2)² ⇒1
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