Using the formula `cos (A+B) = cosA cosB -sin A sin B`. find the value of sin `15^(@)`.

Using the formula of sin(A-B)=sin A cos B-cos A sin B find the value of sin15^(@)

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^@.

Using the formula of sin(A-B)=sinAcosB-cosAsinB find the value of sin 15^@

Using the formula of sin(A-B)=sinAcosB-cosAsinB find the value of sin 15^@

Ifsin(A-B)= sin A cosB-cos A sin B and cos(A-B) = cosA cosB + sin A sin B. Find the values of sin 15^@ and cos 15^@ .

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^(@).

Using the fact that cos (A + B) = cosA cosB - sinA sin B and the differentiation , obtain the sum formula for sine.

Prove that formula cos(A-B)=cos A*cos B+sin A*sin Bwith the help of the formula sin(A+B)=sin A*cos B+cos A*sin B

Using the fact that sin (A + B) = sin A cos B + cos A sin B and the differentiation, obtain the sum formula for cosines.