sin(a+b)=sina*cosb+cosa*sinb
cos(a+b)=cos A*cos B − sin A*sin B
(a+b)^2=a^2+b^2+2ab
for more FORMULA click below link
http://www.math.utah.edu/~gupta/MATH1060Fall2012/FormulaSheet.pdf
sin(a+b)=sina*cosb+cosa*sinb
cos(a+b)=cos A*cos B − sin A*sin B
(a+b)^2=a^2+b^2+2ab
for more FORMULA click below link
http://www.math.utah.edu/~gupta/MATH1060Fall2012/FormulaSheet.pdf