prove that 1+cotx ÷ 1+ tan x = cot x
prove that 1+cotx÷1+ tan x = cot x
x^2=3x-5
evaluate 4x^2-9
y = -x² + 6x - 5
3x^2+6x+1=0
2^-3
3x^2+64x+1=0
x^2-4x+1=0
