PreCalculus - Trigonometry: Trig Identities (35 of 57) Product to Sum Formula 1

In this video I will prove sinAcosB=(1/2)[sin(A+B)+sin(A-B)] and cosAsinB=1/2)[sin(A+B)-sin(A-B)].

[humairaahmed]

On real life, heroes don't wear capes. Like the hero in this video.

[darkoperative]

This showed the addition of formulaes. I was expecting some "shortcut" rhyme or something of the like to remember these formulas. Having to write down the addition of subtraction on all confusing times gets tedious. Great video regardless.

[moslehuddin]

Good job Professor...
Your simplicity makes your lesson awesome...

[bigtnt]

could you do a segment on the subtraction of these equations. The explanation gets a bit muddy in the way the signs are changing.

[potrkca]

your videos are really helpful, Michel!

[renzr]

Thank you very much, coming from a student taking Calculus 2 (Integral Calculus)

[mwerensteijn]

Perfectly clear explained, thanks a lot!

[emanmagdy]

I'm watching this video in 2021... i was really stuck with these equations which are challenging to memorize but now after watching this amazing video, there is no need to memorize any of them, i can easily deduce them ..thank you so much professor

[stargazer]

you literally save my college life, thank you so much!

[ginzamanghaokip]

Thank u sir, u just have 1 more subscriber 🔔🔔😁😁