kallale464 kallale464

06-04-2020
Mathematics

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Simplify the expression using the appropriate identities. (Do not use calculator)
sin 9° cos 10°- cos 9º sin 10° =

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PollyP52 PollyP52

06-04-2020

Answer:

sin -1 degrees.

Step-by-step explanation:

sin (A - B) = sin A cos B - cos A sin B

Therefore sin 9° cos 10°- cos 9º sin 10° = sin (9 - 10)

= sin -1 degrees.

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