trigonometry

Asked by  | 4th Jul, 2008, 04:28: PM

Expert Answer:

cosB(3-4cos2B)

=cosB[3-4(1-sin2B)]

=cosB[3-4 - 4 sin2B]

=cos B [-1 -4(1/4)]

= cosB[-1 +1 ]

= 0

Answered by  | 15th Jul, 2008, 04:28: PM

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