
trig reduction
Sin(180x)
This is my attempt
First I used sum/difference formulae
Sin(AB) =sinAcosBcosAsinB
=sin(180)cos(x)cos(180)sin(x)
=sin(180)cos(x)   cos(180)sin(x)
=0.cos(x) + (1)]sin(x)
=sin(x)
My another option was to multiply by (1)
After multiply I have sin (180+x) which I knw Sin(x) is negative in third quadrant(not sure about this method though)
According to my textbook answer is Sin (x)
Where did I lost it??

Re: trig reduction
Quote:
Originally Posted by
Bonganitedd Sin(180x)
The is an odd function.
This

Re: trig reduction

Re: trig reduction
Quote:
Originally Posted by
Plato The
is an odd function.
This
Or even from the symmetry of the unit circle...