PLEASE HELP ASAP!! a coil of wire rotating in a magnetic field induces a voltage e=20sin(πt/4 - π/2). Use an identity to express this in terms of cos πt/4. (Please show your work as well)

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Which of the following is a function? a.) {(-2, -4/5), (-1,-,,-1)} b.) {(-2,,1/,3/,1)} c.) {(-22)} d.) {(-21)}

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.