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