Trigonometry. Brainliest to the one who gets ALL of them correct! NEED HELP ASAP Verify these Identities:

1. cosx−cosxsin²x = cos³x

2. =

3. + = 2+2cot²a

4. cos⁴b−sin⁴b = 1−2sin²b

5. =

6. (secx−tanx)² =

HELP!!!

Select the correct answer. in the figure, angle k measures 45°. what is the measurement of angle c? a. 38° b. 45° c. 90° d. 98°

Rectangle pqrs has length a and width 4b. the x-axis bisects ps and qr what are the coordinates of the vertices

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer