20 points & Brainliest to the one who gets ALL of them correct! NEED HELP ASAP Verify these Identities & SHOW YOUR WORK:

1. cosx−cosxsin²x = cos³x

2. =

3. cos⁴b−sin⁴b = 1−2sin²b

4. =

5. (secx−tanx)² =

HELP!!!

The ksp expression for the system pbcl2(s) pb+2(aq) + 2 cl-(aq) is: [pbc12][pb+2][2cl-] [pb+2][cl-]2 [pb+2][2cl-]2 [pbcl2][pb+2][cl-]2 [pb+2][2cl-]2[pbcl2]

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.

#7. m is the midpoint of pq, the diameter of the circle o is 13in. and rm = 4in. find pm find pq