The Addition Formulas
The Addition Formulas:
sin ( a + b ) = sin a cos b + cos a sin b
sin ( a - b ) = sin a cos b - cos a sin b
cos ( a + b ) = cos a cos b - cos a cos b
cos ( a - b ) = cos a cos b + cos a cos b
Subject:
Trigonometry [1]
Subject X2:
Trigonometry [1]