Please help me answer!!
verify the following:
1-cosx/1+cosx = secx-1/secx+1

What is the slope of the equation y =

What is the expression in factored form? 225x^2 - 144 a. 9(5x+4)^2 b. 9(5x-4)^2 c. 9(4x+5)(4x-5) d. 9(5x+4)(5x-4)

Me d is also an option but i couldn't get it in the picture