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Question
If sin ( 2A.+ 45° ) = cos ( 30° - A ), find A.
If sin ( 2A.+ 45° ) = cos ( 30° - A ), find A.
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Solution
1) sin(2A + 45) = cos(30-A)
=> sin(2A+45) = sin{90-(30-A)
=> 2A + 45 = 90 - 30 + A
=> A = 60 - 45
=> A = 15
=> sin(2A+45) = sin{90-(30-A)
=> 2A + 45 = 90 - 30 + A
=> A = 60 - 45
=> A = 15
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