Differentiate : ` sin(ax+b)/cos(cx+d)`

Explanation

Let `y = (sin (ax +b))/(cos(cx + d))`
`rArr (dy)/(dx) = (d)/(dx) (sin(ax+ b))/(cos(cx +d))`
`cos (cx + d)(d)/(dx) sin (ax + b)`
`= (- sin (ax + b)(d)/(dx)cos (cx + d))/([cos (cx + d)]^(2))`
` cos (cx + d) cos (ax + b) (d)/(dx)(ax + b)`
`= (+sin (ax + b) sin ( cx + d) (d)/(dx)(cx + d))/( cos ^(2) (cx + d))`
` a cos (cx + d) cos (ax + b) `
`= (+ c sin (ax + b) sin (cx + d)) /(cos ^(2) (cx + d) ` .