Sum and Difference Identities of Sine and Cosine

This trigonometry video tutorial explains how to find the exact of trigonometric expressions with angles in radians and degrees using the sum and difference identities & formulas of sine and cosine. This lesson contains plenty of examples and practice problems that will help you to get a thorough understanding of this material.

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[georgesadler]

MR. Organic Chemistry Tutor, thank for a classic topic and master selection of Sum and Difference Identities of Sine and Cosine.

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[aserawi]

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[ericamusonda]

I am having a bit of trouble following you on the evaluation of the special angle solutions for the first question.... Sin 45degrees is actually 1/(root of 2)
but its stated (root of 2)/2

where am i going wrong?
cause i have rechecked the triangle multiple times

P.S cant find the symbols lol

[sanopann]

can you add or subtract the radicals ???? if not why this cancel at 8:28

[franciskwaw]

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[DodgeThis]

What about something like sin285 degrees?

[damiantorres]

how come at the end question with tan you cant do 45 degrees-30 degrees to get tan 15 degrees?

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[maddelynatwater]

bruh, am i just a silly little goose ?? or what? i thought quadrant 2 was negative...【・_・?】15:12 got me confused lol (rest of the video was very helpful tho)

[lrosales]

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