Prove that tan⁴O+ tan²O=sec⁴O-sec²O

Solve this and show you’re work step by step ! -5 3/4+3h< 9 1/4 -

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

What is the value of x when x + 7 = 21?