SOLUTION: State the formula for sin(a+b) and use it to show sin(a+Pi/2)=cos a

Algebra ->  Trigonometry-basics -> SOLUTION: State the formula for sin(a+b) and use it to show sin(a+Pi/2)=cos a      Log On

 

Hi,

sin(a + b) = sin a cos b  +  cos a sin b

= cos a

Note:  and