Express each as a product
`cos 35^(@) - cos 75^(@)`

Express each as a product cos 65^(@) + cos 15^(@)

cos 15^(@) - cos 75^(@) =

Express each as a product sin 75^(@) - sin 35^(@)

Cos15^(@) - Cos75^(@) =

cos15^(@)-cos75^(@)=

Express as product form: 1+2cos20^(@)

Express each of the folloiwng as a product (i) sin 75^(@)-sin 35^(@) (ii) cos 65^(@)+cos 15^(@) (iii) sin 50^(@)+sin 40^(@) (iv) cos 35^(@)-cos 75^(@) .