simplify to a constant or trig func.
1. sec ²u-tan ²u/cos ²v+sin ²v
change expression to only sines and cosines. then to a basic trig function.
2. sin(theta) - tan(theta)*cos(theta)+ cos(pi/2 - theta)
3. (sec y - tan y)(sec y + tan y)/ sec y
combine fractions and simplify to a multiple of a power of a basic trig func.
4. (1/(1-sin x)) + ((1/(1+sin x))
5. sin x/1-cos x + 1-cos x/ sin x
write in factoed form of a single trig func.
6. 1-2sin x + sin²x
7. sin x - cos²x - 1