Tori's blog.

When doing 8-5, you have to use identities and inverse to solve for the variable in the problem. And if you cannot make the trig functions the same, try to change them to tan (sin/cos) or cot (cos/sin).

Things you CANNOT do:
- dividing by a trig function when solving to cancel
- cancel from the inside of a trig function
EX. 1: sin (2x)/2 => the 2s cannot cancel
EX. 2: sin 2x=sin x => you cannot divide and cancel


2 Sin ² θ-1 =0
2 Sin ² θ=1
Sin ² θ= ½
Sin θ= +/- √ ½
θ= Inverse Sin (√ ½)
QI: 45 °
QII: 135°
QIII: 225°
QIV: 315°