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How to verify a trig identity

4,406 views · Published 28 March 2012 · 4:19 · Indexed 6 November 2026

Channel: Brian McLogan · 2012 · Education

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👉 Learn how to verify trigonometric identities having rational expressions. To verify trigonometric expression means to verify that the term(s) on the left hand side of the equality sign is equal to the term(s) on the right hand side.  To verify rational trigonometric identities, it is usually more convenient to start with getting rid of the denominator(s) of the rational term(s). This can be done by multiplying both the numerator and the denominator by the conjugate if the denominator involves addition/subtraction or by the reciprocal if the denominator involves product.

For non-rational trigonometric identities, we can replace given trigonometric functions/identities with equivalent trigonometric functions/identities and evaluate accordingly.

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Organized Videos:
✅ Verify Trigonometric Identities
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMos0wJjgo2eAIU0pwSOJiFO
✅ Verify Simple Trigonometric Identities
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMpz2HcKBer2ZvSJukha_c-N
✅ Verify Trigonometric Identities with Rational Expressions
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMrpLos0wctDmyZ2CUAWqrxN
✅ Verify Trigonometric Identities by Multiplying
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoXcPHJcaeY2T39zP9YxGbn
✅ Verify Trigonometric Identities by Adding and Subtracting
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMoZqv87EvOZMrDTvYv9Q9wI
✅ Verify Trigonometric Identities with Fractions
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMppMSO7qBzxCz7fOBwiqA_6
✅ Verify Trigonometric Identities by Pythagorean Identities
https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMq17Jbf1tWpi7fGFuL5fBAv

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