IF A=30 THEN 4 COS3A-3COSA
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Answer:
cos 3A=4cos 3 A-3cos A
A =30
L.H.S =cos(3*30) R.H.S =4cos^3(30) -3cos(30)
=0 =4*[3root3/8] -3root3/2
=3root3[1/2 - 1 /2]
=3root*0
=0//
accordingly L.H.S =R.H.S//
cos 3A=4cos 3 A-3cos A
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