How to simplify tan^2 x-sec^2 x/cos x

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

Me asap! what is the slope of this line? enter your answer in the box.

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2