The point of multiplication and factorization A2-B2 = (A+B) (A-B) A3+B3 = (A+B) (A2-AB+B2) A3-B3 = (A-B (A2+AB+B2) Trigonometric Inequality | A+B |≤ A | A | A | A. B | A | A | B | A | A | A | A | B | B | A | A | A | B | B | A | A | B | A | A | A | B | B | A | A | B | A | A | B | A | A | B | B | A | A | A | B | A | A | B | A | B | A | B-B ≤ A ≤ B | A-B |≥| A |-A |≤ A | Solution of a quadratic equation with one variable-B+√ (B2-4ac)/2A root and. 0 Note: The equation has two unequal real roots B2-4ac；; 0 sector area formula s= 1/2*l*r cone volume formula V= 1/3*S*H cone volume formula V= 1/3*pi*r2h oblique prism volume V=S'L note: where s' is the straight cross-sectional area, and l is the one with a long cylinder with a side.