Question

prove that cosx/sin(90-x)+sin(-x)/sin(180+x)-tan(90+x)/cotx =3

Answer 1

we know that
sin (90-x)= cosx
and sin-x= -sinx
and sin (180+x)= -sinx

so , cosx/cosx + (-) sinx/(-sinx) - (-) cotx/cot x= 1+1+1=3

refer to this table for any reference

if u have any other doubts don't hesitate to ask

regards
nimit sharma

Answer 2

This is the solution to your question....Please reference to this