if A and B are two positive acute angles satisfying A - B = 15° and sin A = cos 2B the the value of A + B ?????
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sinA= cos2B
sinA =sin(90-2B)
A=90-2B
A+2B = 90
also, A - B = 15
solving both the equations we get A = 60 and B = 15
A + B = 60 + 15 = 75.
we cant take A = 30 because it will not satisfy
sinA = cos2B
sinA =sin(90-2B)
A=90-2B
A+2B = 90
also, A - B = 15
solving both the equations we get A = 60 and B = 15
A + B = 60 + 15 = 75.
we cant take A = 30 because it will not satisfy
sinA = cos2B
mehulgupta12385:
sorry but answer is 65
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