**See Also**

evaluating expressions video, evaluating trigonometric expressions video, expressions video, identities video, trigonometric expressions video, trigonometric identities video.

This math video tutorial gives a step by step explanation to a math problem on "Evaluating Trigonometric Expressions Using Difference Of Two Angles Identity".

Evaluating trigonometric expressions using difference of two angles identity video involves evaluating expressions, evaluating trigonometric expressions, expressions, identities, trigonometric expressions, trigonometric identities. The video tutorial is recommended for 7th Grade, 8th Grade, 9th Grade, 10th Grade, 11th Grade, and/or 12th Grade Math students studying Algebra, Trigonometry, Pre-Algebra, and/or Advanced Algebra.

For a given combination of values for the free variables, an expression may be evaluated, although for some combinations of values of the free variables, the expression may be undefined. Thus an expression represents a function whose inputs are the values assigned the free variables and whose output is the resulting value of the expression.

An expression is a combination of numbers, operators, grouping symbols (such as brackets and parentheses) and/or free variables and bound variables arranged in a meaningful way which can be evaluated. Bound variables are assigned values within the expression (they are for internal use) while free variables can take on values from outside the expression.