maths
Bro is it clear now.....
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Option c 4 sin square alfa
sagar248:
can u plz show the process
ya
We have, cos-1x - cos-1y2 = α⇒cos-1xy2 + 1-x21-y24 = α⇒xy2 + 1-x21-y24 = cos α⇒xy2+ 4-y2-4x2+x2y22 = cos α⇒xy + 4-y2-4x2+x2y22 = cos α⇒xy + 4-y2-4x2+x2y2 = 2 cos α⇒4-y2-4x2+x2y2 = 2 cos α - xy⇒4-y2-4x2+x2y2= 4 cos2α + x2y2 - 4xy cos α⇒4-y2-4x2 = 4 cos2α - 4 xy cos α⇒4x2 + y2 - 4xy cos α = 4 - 4 cos2α⇒4x2 + y2 - 4xy cos α = 41-cos2α⇒4x2 + y2 - 4xy cos α = 4 sin2α
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