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Please Check these Intro Videos to Trig:
- 30-60-90 Triangle Proof and ALL Trig Ratios [ Ссылка ]
- 45-45-90 Triangle and ALL Trig Ratios [ Ссылка ]
- Unit Circle Trigonometry. Sin, Cos, and Tan. Easy Trick! [ Ссылка ]
- Use Reference Angles to Evaluate Trig Functions [ Ссылка ]
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In this lesson, I explained how to use the sum and difference identities for the sine and cosine functions to prove identities. I also used the Pythagorean Identity in the proof.
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