Question 611743
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