This trigonometry video tutorial discusses common trig identities and formulas such as the Pythagorean identities, reciprocal identities, quotient identities, even odd identities, cofunction identities, double angle formulas, half angle formulas, sum and difference identities, power reducing formulas, product to sum identities, and sum to product identities.
Trigonometry - Free Formula Sheet:
https://bit.ly/47diggI
Trigonometry Video Lessons:
https://www.video-tutor.net/trigonometric-identities.html
Trigonometry Final Exam Review:
https://www.youtube.com/watch?v=OAsbx4TEnL0