Question

Find a possible solution to the equation sin(3x+13)=cos(4x).
A. x=-13 degrees
B. x=0 degrees
C. x=11 degrees
D. x-13 degrees

Answer 1

just replace x in the equation by the values of x in the options and see which one fots

Answer 2

* fits

Answer 3

hint: cos(4x) = sin(90 - 4x)

Answer 4

still dont get it

Answer 5

sin(3x+13)=cos(4x)
sin(3x+13)=sin(90 - 4x)

this implies
3x + 13 = 90 - 4x

solve for x

Answer 6

x=11

Answer 7

right