Solving Trigonometric Equations By Factoring & By Using Double Angle Identities | Summary and Q&A

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October 21, 2017
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The Organic Chemistry Tutor
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Solving Trigonometric Equations By Factoring & By Using Double Angle Identities

TL;DR

Learn how to solve trigonometric equations by factoring, using substitution and various techniques, to find the values of x within a given range.

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Questions & Answers

Q: How can trigonometric equations be solved by factoring?

Trigonometric equations can be solved by factoring trinomials using substitution. By replacing the trigonometric function with a variable, factoring the resulting trinomial, and substituting the variable back in, solutions can be found.

Q: What is the process for factoring trinomials in trigonometric equations?

To factor trinomials in trigonometric equations, find two numbers that multiply to the constant term and add to the middle coefficient. Replace the middle coefficient terms with these two numbers and factor by grouping. This will result in a product of two binomials in terms of the variable.

Q: How can the range of solutions be determined for trigonometric equations?

To determine the range of solutions, set each factor in the factored form equal to zero and solve for the variable. Consider the restrictions and ranges of the specific trigonometric function involved to identify valid solutions within the given range.

Q: Can the arc sine function be used to solve trigonometric equations?

While the arc sine function can be used to find the inverse of sine, it is important to note that it has limitations. The arc sine function only provides one solution within the range of -π/2 to π/2. Trigonometric equations with multiple solutions require considering the range of the specific trigonometric function.

Summary & Key Takeaways

  • Trigonometric equations can be solved by factoring trinomials and using substitution.

  • By replacing sine x with y, factoring the trinomial, and substituting y with sine x, the equation can be simplified and solutions can be found.

  • Similar techniques can be applied to solve equations involving cosine, cosecant, and arccosine.

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