यदि `A = 60^(@)` और `B = 30^(@)` तो दिखाइए कि :
` sin A cos B + cos A sin B = sin (A + B)` `

Explanation

` sin 60^(@) cos 30^(@) + cos60^(@) sin30^(@)`
` (sqrt(3))/(2) xx(sqrt(3))/(2) + (1)/(2) xx(1)/(2)`
` = (3)/(4) + (1)/(4) = (4)/(4) = 1`
` R.H.S. = sin (A + B) = sin (60^(@) + 30^(@)) = sin 90^(@) = 1`
` therefore ` L.H.S., = R.H.S.