SOLUTION: Solve the equation (sinA = cos(A + 20))

Algebra ->  Trigonometry-basics -> SOLUTION: Solve the equation (sinA = cos(A + 20))      Log On


   

Question 611743: Solve the equation (sinA = cos(A + 20))
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Solve the equation (sinA = cos(A + 20))
sinA=cos(A+20)
sinA=cosAcos20-sinAsin20
sinA+sinAsin20=cosAcos20
sinA(1+sin20)=cosAcos20
sinA/cosA=cos20/(1+sin20)
tanA≈.70
A=34.99º