Question

Can someone check my work ?
[ sin(x)*tan(x) ]/ cos(x)
=[sin(x)*sin(x)/cos(x)]/ cos(x)
=[sin^2(x)/cos(x)]/cos(x)
=[1-cos^2(x)] /cos(x)
and I'm stuck here !

Answer 1

from line 3 , = sin^2/cos^2 = tan^2

Answer 2

Oh now I see it !

Answer 3

Thank you both so much !