cos2b-cos2a=? find the value
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cos2b-cos2a
here A=2b, and B=2a
we know that,
cos(A-B)=cosAcosB+SinAsinB
so, cos2b-cos2a =cos(2b-2a)
cos2b.cos2a+sin2b.sin2a
cos power2 4ba +sin power2 4ba
w.k.t cos power 2tita+sinpower2 titanium=1
so ans is 1
here A=2b, and B=2a
we know that,
cos(A-B)=cosAcosB+SinAsinB
so, cos2b-cos2a =cos(2b-2a)
cos2b.cos2a+sin2b.sin2a
cos power2 4ba +sin power2 4ba
w.k.t cos power 2tita+sinpower2 titanium=1
so ans is 1
saicharan06467:
it is not cos(a-b)
it is cosa-cosb
cos take common
then cos(a-b)
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