SOLUTION: This topic i dont understand .how is this done? Use even and odd properties of the trigometric function to find the exact calue of cos (-150 degrees) Use even and odd propert

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Question 756116: This topic i dont understand .how is this done?
Use even and odd properties of the trigometric function to find the exact calue of cos (-150 degrees)
Use even and odd properties of the trigometric function to find the exact calue of cos (150 degrees)
Answer by lwsshak3(11628) About Me  (Show Source):
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This topic i dont understand .how is this done?
Use even and odd properties of the trigometric function to find the exact calue of cos (-150 degrees)
Use even and odd properties of the trigometric function to find the exact calue of cos (150 degrees)
***
For even functions:
f(-x)=f(x)
For odd functions
f(-x)=-f(x)
..
cos is an even function
cos(150º)=cos(-150º)=-√3/2 (in Q2 and Q3 where cos<0, with 30º reference angle)
hope this helps.