SOLUTION: The expression cos 16º cos 164º minus sin 16º sin 164º a) SQRT3/2 b) – 1/2 c)0 d)-1 Answer: d (Just checking to make sure that I did my HW correct) Thanks

Algebra ->  Trigonometry-basics -> SOLUTION: The expression cos 16º cos 164º minus sin 16º sin 164º a) SQRT3/2 b) – 1/2 c)0 d)-1 Answer: d (Just checking to make sure that I did my HW correct) Thanks       Log On


   

Question 388941: The expression cos 16º cos 164º minus sin 16º sin 164º
a) SQRT3/2 b) – 1/2 c)0 d)-1
Answer: d (Just checking to make sure that I did my HW correct)
Thanks
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
This is equal to cos(180) which is equal to -1, so D is correct.