1.

4) If 2 cos 2 B = 1, and B is an acute angle, find the value of sin 3 Bi. 0ii. 1​

Answer»

Step-by-step EXPLANATION:

cos4x+COS3X+cos2x

=

(sin4x+sin2x)+SIN3X

(cos4x+cos2x)+cos3x

=

2sin3xcosx+sin3x

2cos3xcosx+cos3x

=

sin3x[2cosx+1]

cos3x[2cosx+1]

=cot3x



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