Is Amy’s answer accurate

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2