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Solve for the value of x for
Solution:
Consider the given equation above
As you notice that all trigonometric functions have different angles. In this type of trigonometric equation, we have to use the Sum to Product Formulas. The left side of the equation can be written as
Note: I am strongly advice to memorize or remember all trigonometric identities and formulas as much as you can because you will use those in proving the trigonometric identities and even in higher Math subjects like Differential Calculus, Integral Calculus, and Differential Equations.