# Integrating Trigonometric Functions by Double Angle Formula

Integrating Trigonometric Functions by Double Angle Formula Integrating Trigonometric Functions can be done by Double Angle Formula reducing the power of trigonometric functions. \begin{aligned} \displaystyle \cos{2A} &= 2\cos^2{A} – 1 \\ &= 1 – 2\sin^2{A} \\ &= \cos^2{A} – \sin^2{A} \\ \end{aligned} \\ Practice Questions Question 1 Find $$\displaystyle \int{\cos^2{x}}dx$$. Question […]

# Trigonometric Integration by Substitution

Trigonometric Integration by Substitution Trigonometric Integration by Substitution can be handled using the basic rules such as $$\displaystyle \frac{d}{dx} \sin{x} = \cos{x} \text{ and } \frac{d}{dx} \cos{x} = -\sin{x}$$. Practice Questions of Trigonometric Integration by Substitution Question 1 Find $$\displaystyle \int{\sin{x}\cos^2{x}}dx$$. Question 2 Find $$\displaystyle \int{\cos{x}\sin^2{x}}dx$$. Question 3 Find […]

# Definite Integration by Substitution

Definite Integration by Substitution Definite Integration by Substitution requires to convert upper and lower limits of definite integration. $$\displaystyle \int_{x=a}^{x=b}{f(x)}dx = \int_{u=c}^{u=d}{f(u)}du$$ Practice Questions of Definite Integration by Substitution Question 1 Find $$\displaystyle \int_{-1}^{0}{x(1+x)^{10}}dx$$. Question 2 Find $$\displaystyle \int_{0}^{1}{x \sqrt{1-x^2}}dx$$. Question 3 Find $$\displaystyle \int_{3}^{18}{\frac{x}{\sqrt{x-2}}}dx$$.

Integration by Substitution Integration by Substitution is performed by replacing the pronumeral (variable) to other pronumeral to simplify the expression for integrating easier. Students often made mistakes by forgetting to replace back to the original pronumeral. Practice Questions of Integration by Substitution Question 1 Find $$\displaystyle \int{\frac{2x}{\sqrt{x^2-4}}}dx$$. Question 2 Find $$\displaystyle \int{\frac{x^2}{\sqrt{1-x^3}}}dx […] # Definite Integrals Background of Definite Integrals Definite Integrals are calculated by subtracting the function values of upper and lower limits. \displaystyle \int_{a}^{b}{f(x)}dx = F(a) – F(b), \text{where } \frac{d}{dx}F(x) = f(x) Practice Questions Question 1 Evaluate \( \displaystyle \int_{0}^{2}{6x}dx$$. Question 2 Evaluate $$\displaystyle \int_{2}^{4}5dx$$. Question 3 Evaluate $$\displaystyle \int_{1}^{3}{(2x+4)}dx$$. Question 4 Evaluate $$\displaystyle […] # Indefinite Integral of Rational Functions Understanding Indefinite Integral of Rational Functions Using Indefinite Integral of Rational Functions requires that the format of the expression must be power of linear expressions, such as \( (3x-1)^3, (2x+3)^3, \sqrt{4x-1}$$, etc. $$(3x^2-1)^3, (2\sqrt{x}+3)^3, \sqrt{4x^3-1}$$ are not applicable for this formula. $$\displaystyle \int{(ax+b)^n}dx = \dfrac{(ax+b)^{n+1}}{a(n+1)} + C \ (n \ne -1)$$ Practice […]

Radical Indefinite Integrals should be performed after converting its radical or surd notations into index form. $$\displaystyle \sqrt[n]{x^m} = x^{\frac{m}{n}}$$ Practice Questions Question 1 Find $$\displaystyle \int{\sqrt{x}}dx$$. Question 2 Find $$\displaystyle \int{\sqrt[3]{x^5}}dx$$. Question 3 Find $$\displaystyle \int{\sqrt{5x^3}}dx$$. Question 4 Find $$\displaystyle \int{\frac{3x-1}{\sqrt{x}}}dx$$.