For all values of angle A and B `(i)cos(A-B)=cosAcosB+sinAsinB (ii) cos(A+B)=cosAcosB-sinAsinB`

For all values of angle A and B(i)sin(A-B)=sin A cos B-cos A sin B(ii)sin(A+B)=sin A cos B+cos A sin B

For any angles A and B, cos(A+B).cos(A-B)=…..

If A=60^(@) and B=30^(@) , verify that : (i)sin(A+B)=sinAcosB+cosAsinB (ii) cos(A+B)=cosAcosB-sinAsinB

If A=60^(@) and B=30^(@) , verify that : (i)sin(A-B)=sinAcosB-cosAsinB (ii) cos(A-B)=cosAcosB+sinAsinB (iii) tan(A-B)=(tanA-tanB)/(1+tanAtanB)

Prove (i)cos(A+B)+cos(A-B)=2cos A cos B(ii)cos(A-B)-cos(A+B)=2sin A sin B

Using vector method prove that cos(A-B)=cosAcosB+sinAsinB

If A=30o and B=60o ,verify that sin(A+B)=sin A cos B+cos A sin B(ii)cos(A+B)=cos A cos B-sin A sin B

In a Delta ABC ,angle C=90^(@)and tan A=(1)/(sqrt(3)). find the values of : (i) (sin A*cos B+ cos A*sin B ) " " (ii) (cos A*cos B-sin A*sin B)

cos^(2)(A-B)+cos^(2)B-2cos(A-B).cosA.cosB=?

The expression cos^(2)(A-B)+cos^(2)B-2cos(A-B)cosAcosB is