Which expression is equivalent to

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

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.

Ron has 8 caps and 4 of his caps are blue. thes rest of his cap are red. how many of ron's caps are red