If cosA=3/4,then find the value of 32sinA/2.sin
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Answer:
Explanation:
32sinA/2sin5A/2 = 16cos2A -16cos3A
16{ 2cos²A -1 -4cos³A+3cosA}
=16{ 2(3/4)²-1-4(3/4)³+3(3/4)}
=16{ 18/16 -1 -27/16 +36/16}
=( 18 -16 -27 +36}
=11
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