if sinA=1/2,then the value of 3cosA-4cos³A is:
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Step-by-step explanation:
sin A =1/2
A = 30 DEGREE
HENCE , PUTTING THE VALUE OF A
= 3COS 30 DEGREE - 4COS^3 30 DEGREE
= 3*SQUARE ROOT OF 3/2 - 4(SQUARE ROOT OF 3/2)^3
= 0
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