Please help what's the exact value for x?

cos(x+pi)-sin(x-pi)=0
SHOW WORK PLEASE​

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.

Sara has 2 2/3 cup taco meat. she needs 1/6 cup to make one taco. how many tacos can sara make with the taco meat she has?