Question

114. यदि A = 30°, तो सिद्ध कीजिए sin 3A =3sin A-4sin'A​

Answer 1

Answer:

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