Question

Hi
how can I solve this trig identity?
(sin(pi-x)cot(pi/2 - x) cos(2pi - x))/(tan(pi + x)tan(pi/2 + x)sin(-x)) = sinx ?

can something like tan (a + b) be sin (a+ b)/cos(a + b)?

Answer 1

yes, something like tan(a+b) can be sin(a+b)/cos(a+b)

Answer 2

Make use of the odd function property of sin and the even function property of cos, these are:
sin(-x) = -sin(x) and cos(-x)=cos(x) respectively.
the fact that sin(x+Pi/2) = cos(x) and cos(x-Pi/2)=sin should help also

Answer 3

Oh okay Thank you very much