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How to use the subtraction of two angles

3,957 views · Published 20 April 2012 · 6:56 · Indexed 23 October 2026

Channel: Brian McLogan · 2012 · People & Blogs

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👉 Learn how to evaluate the tangent of an angle in degrees using the sum/difference formulas. To do this, we first express the given angle as a sum or a difference of two (easy to evaluate) angles, then we use the unit circle and the Pythagoras theorem to identify the angles and obtain all the needed trigonometric function values of the angles. When we know the trigonometric function values of the two angles to be added or subtracted, we can apply the sum and difference formulas to evaluate the tangent of the given angle.

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Organized Videos:
✅ Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZModptYHwpZKF4wDnuLmUoCn
✅ Evaluate Sum and Difference Formulas from a Triangle
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrYGCXxoHbj-53f-PPMigcD
✅ Simplify an Expression using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrLOxnjPokBJ5ixvPLGQeFe
✅ Write the Expression as a single function | Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMpaN-CjBrywDF3pwkK0wyIJ
✅ Verify Identities using Sum and Difference Identities
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMo8pki6ZB39Ht7YrskfdeHk
✅ Evaluate Tangent using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMqW82gHtq7LxLJF37KOPSRb
✅ Evaluate Cosine using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMqmSBX4k9m9ixWPC-74xr1X
✅ Evaluate Sine using Sum and Difference of Two Angles
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoPJMGuSrPj8H3iioeVyfR3
✅ Solve Equations using Sum and Difference Formulas
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoor9EhF5eP7QH1_o60yJ1l

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