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## Text Lessons

❶Trig without Tears Detailed instruction on trigonometric identities, functions, special angles, Law of Sines and Cosines, and inverse trigonometric functions. Trigonometric Identities Sort by:

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Most of this can be done using the quotient and reciprocal identities. Check all the angles for sums and differences and use the appropriate identities to remove them. Check for angle multiples and remove them using the appropriate formulas. Expand any equations you can, combine like terms, and simplify the equations.

Replace cos powers greater than 2 with sin powers using the Pythagorean identities. Factor numerators and denominators, then cancel any common factors. Now, both sides should be exactly equal, or obviously equal, and you have proven your identity. Everything is already in sin and cos, so this part is done. Since there are no sums or difference inside the angles, this part is done.

Use the double angle formula: Here is where your algebra knowledge comes in. Now, our problem looks like this:. The sides are almost the same. There are no powers greater than 2, so we can skip this step. Since cos 2 x - sin 2 x appears on both sides of the equation, we can cancel it. We are left with: Detailed instruction on trigonometric identities, functions, special angles, Law of Sines and Cosines, and inverse trigonometric functions.

Mathematics Articles by Stan Brown. Contains formulas to help with pythagorean identities, unit circle values, periods of trig functions, angle addition identities, and much more. Pauls Online Math Notes. Table of Trigonometric Identities. This youtube video shows an easy way to remember the values of the unit circle that can be helpful for trigonometry students. How to solve trigonometric equations. Resources Math Trigonometry Trigonometric Identities.

For more information call us at: Posts tagged "urgent," "ASAP," "important," "due in an hour," etc. Requests for help with cheating, plagiarism, or other violations of academic integrity; violations of copyright or terms of use; or other illegal or unethical activities.

Keep in mind that we do not and will not have any sort of vetting procedure for responders. Accept answers at your own risk. We use automoderator for a few things. It may delete a post erroneously. If your post is missing and you're sure it's not a rule-breaker, send us a note and we'll look into the issue. We ban all bots. I'm having some trouble with proving these two identities. I then tried to make the entire right side of the identity into a fraction: I'm not sure where to go from this point.

For 10, are you sure you're not solving for B? I just found out that it is possible to state that LS is not equal to RS, and thus, I believe that solves 10 for me. I'm still a bit confused about that question. Use of this site constitutes acceptance of our User Agreement and Privacy Policy. Log in or sign up in seconds.

## Main Topics

The Trigonometric Identities chapter of this High School Precalculus Homework Help course helps students complete their trigonometric identities.

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