Varify the formula for`A=60^@` and `B=30^@`.
`cos(A-B)=cos A cos B+sin A sin B`

For any A,B in R, prove that cos(A-B)=cos A cos B+sin A sin B

If A=60^(@),B==30^(@) then verify that cos(A+B)=cos A*cos B-sin A*sin B

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

If A = 30^(@) and B = 60^(@) , verify that cos (A + B) = cos A cos B - sin A sin B.

By taking A = 90^@ and B = 30^@ , show that sin (A - B) = sin A cos B-cos A sin B.

If sin A=(1)/(sqrt(5)) and sin B=(1)/(sqrt(10)) ,find the values of cos A and cos B .Hence using the formula cos(A+B)=cos A cos B-sin A sin B, show that (A+B)=45^(@).

If A= 30^(@) and B=60^(@) verify that: sin (A+B)= sin A cos B +cosA sin B.

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

Find the value of cos 15^(@) using the relation cos (A - B) = cos A cos B + sin A sin B .

If sin (A-B)=sin A cos B-cos A sin B and cos (A - B) = cos A cos B + sin A sin B . find the values of sin 15^@ and cos 15^@.