Express each of the products into sums or difference of sines and cosines : `2cos 9theta. Cos 4theta`

Express in the products into sums or difference of sines and cosines : 2 sin 5theta. Cos 3theta

Convert each of the following products into the sum or difference of sines and cosines: 2cos4thetacos3theta

Express each of the following as the sum or difference of sines and cosines: \ 2cos7thetacos3theta

Convert each of the following products into the sum or difference of sines and cosines: 2sin5theta\ costheta

Express each of the following as the sum or difference of sines and cosines: \ 2cos3thetasin2theta

Convert each of the following products into the sum or difference of sines and cosines: \ 2sin3thetasintheta

Express each of the following as the sum or difference of sines and cosines: \ 2sin4thetasin3theta

Express each of the following as the sum or difference of sines and cosines: \ 2sin4thetasin3theta

Express each of that as the sum or difference of cosines and sines: 5 sin theta.sin 8theta

Express each of the following as the sum or difference of sines and cosines: 2sin3thetacostheta