CBSE Class 10 Answered
Trigo
Asked by baidshryans | 29 Jan, 2009, 06:49: PM
Expert Answer
tan (60 - A) + tan (30 + A) = (tan 60 - tan A) / (1 + tan 60 tan A ) + ( tan 30 + tan A) / (1 - tan 30 tan A) = 2
===> 3 - tan A ) / ( 1 + 3 tan A) + 1 + 3 tan A ) / ( 3 - tan A ) = 2 now solving we get A = 15
===> so sin 2A = sin 30 = 1/2 and 2 cos 4A = 2 cos 60 = 1
Answered by | 29 Jan, 2009, 11:34: PM
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