trigonometry

Jeezer:

40 sin^2y cosy / 5 siny cos^2y

You have written

(40 sin ²y cosy / 5) * siny cos ²y


OR do you mean


(40 sin ²y cosy) / (5 siny cos ²y) ?

You need to make good use of brackets to display your question properly.

I will assume you mean the 2nd one

(40 sin ²y cosy) / (5 siny cos ²y) = 8siny/cosy = 8tany