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[" 10.Show by vector mcurva cinut sin "2...

[" 10.Show by vector mcurva cinut sin "2A=2sin A cos A" ."],[" 11.Show by vector method that "sin2A=2sin" sin "]

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Show by vector method that sin 2A=2sin A cosA .

Show by vector method that sin 2A=2sin A cosA .

Show by vector method that sin(alpha-beta)=sinalphacosbeta-cosalpha sinbeta.

Show by vector method that sin(alpha-beta)=sinalphacosbeta-cosalpha sinbeta.

Prove by vector method that sin(A-B)=sin A cos B-cos A sin B and sin(A+B)=sin A cos B+cos A sin B

Show that sin 3 A + sin 2A -sin A = 4 sin A cos (A)/(2) cos "" (3A)/( 2)

Show that cos 2A=cos^(2)A-sin^(2)A

If b+c=2a , show that, 2sin 'A/2' = sin (B+A/2)

If cos A = tan B , cos B= tan C, cos C= tanA , show that sin A= sin B= sin C= 2 sin 18^(@)

Show that (sin x+cos x)^(2)+(sin x-cos x)^(2)=2