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If cos x= sin(20 + x)" and 0º
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If cos x= sin(20 + x)" and 0º

User David Zhang
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Draw a right angle triangle
Let one of the angles be A
cos A = sin (90-A)
90 - x - 20 = x
2x = 70
x = 35 degrees
User Rudra Prasad Samal
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