7.5 and 7.6

sine (A+B) formula = sine a cos b + cos a sine b
How to remember sine a+ b formula for sine a+beeee use abab cosine in the midllee ab + ab (multiply ab + ab)
cos (A+B) formula = cos a cosb - sina sineb
how to remember cos ab formula for cosine, plus, cosine in the front, ab-ab
Sine double SIne 2 0 2 sine cos 0
cos 2 0 cos sqaured 0- sine squared 0