114. यदि A = 30°, तो सिद्ध कीजिए sin 3A =3sin A-4sin'A
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putting A = 30 in above equation we get
sin90 = 3*sin30 - 4sin³30
1 = 3/2 - 4(1/2)³
1 = 3/2 -1/2 = 1
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