The limits of integration for an integral are typically given in the problem statement. If they are not explicitly stated, you can determine them by looking at the function being integrated and identifying the points where it intersects the x-axis.
Yes, substitution is a common technique used to solve integrals. It involves replacing a variable in the integral with a new variable in order to simplify the problem.
The best method for solving a trigonometric integral depends on the specific problem. Some common techniques include using trigonometric identities, integration by parts, and substitution.
In general, integrals are solvable as long as the function being integrated is continuous on the interval of integration. However, some integrals may require advanced techniques or numerical methods to solve.
Yes, there are many calculators and computer programs available that can solve integrals. However, it is important to understand the concepts and techniques behind solving integrals in order to use these tools effectively.