SOLUTION: Find the exact value of: sin 70degrees cos 40degrees - cos 70degrees sin 40degrees.

SOLUTION: Find the exact value of: sin 70degrees cos 40degrees - cos 70degrees sin 40degrees.

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Question 149423: Find the exact value of:
sin 70degrees cos 40degrees - cos 70degrees sin 40degrees.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given expression.

Rewrite the expression using the identity

Subtract

Take the sine of 30 to get 1/2

So
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