Expand the Trigonometric Expression (px+qy)^3

${(p x + q y)}^{3}$

Step 1

Use the Binomial Theorem.

${(p x)}^{3} + 3 {(p x)}^{2} (q y) + 3 (p x) {(q y)}^{2} + {(q y)}^{3}$

Step 2

Simplify each term.

Apply the product rule to $p x$ .

$p^{3} x^{3} + 3 {(p x)}^{2} (q y) + 3 (p x) {(q y)}^{2} + {(q y)}^{3}$

Apply the product rule to $p x$ .

$p^{3} x^{3} + 3 (p^{2} x^{2}) (q y) + 3 (p x) {(q y)}^{2} + {(q y)}^{3}$

Apply the product rule to $q y$ .

$p^{3} x^{3} + 3 p^{2} x^{2} q y + 3 p x (q^{2} y^{2}) + {(q y)}^{3}$

Apply the product rule to $q y$ .

$p^{3} x^{3} + 3 p^{2} x^{2} q y + 3 p x q^{2} y^{2} + q^{3} y^{3}$