So i was checking Edline last night and when i saw my math mark i had a mild heart attack. Turns out I forgot to post those examples and i am so sorry since maybe if i had it would have helped someone with the test we wrote.. my apologies. I'm hoping that i can still get a mark for this but even if i don't i thought i'd do it for the benefit of my classmates.
So here she is:

1. Find exact value of sin75.

sin(30+45) = (sin30*cos45)+(cos30*sin45)
= [(1/2)*((sqrt.2)/2))]+[((sqrt.3)/2)*((sqrt.2)/2)]
= ((sqrt.2)/4)+((sqrt.6)/4)
= ((sqrt.2)+(sqrt.6))/4

2. Simplify sin5xsin3x- cos5xcos3x.
= -(cos5xcos3x+sin5xsin3x)
= - cos(5x+3x)
= -cos8x