Cos20cos30 + sin20sin30 ?
1 Answer
Feb 28, 2018
See explanation...
Explanation:
Alright, this is one of the 3 massive fundamental rules of trigonometry. There three rules are:
1)
2)
3)
Rule three here is interesting because this can also be written as
This is true because
Alright, now that we understand that, lets plug in you number to the formula. In this case,
So the final answer is
Hope this helped!
~Chandler Dowd