Find the value of A, if sin(90dgree-2a)=cos60dgree andA is an acute angle
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sin(90° - 2A) = cos (60°)
=> cos (2A) = cos (60°) [°.° sin (90°- C) = cos (C)]
=> 2A = 60° [By equating ]
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=> | A = 30° |
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sin [ 90° - 2a] = cos [60°]
cos [2a] = cos [60°]
2a = 60°
a = 30 °
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