Consider the function: f(t) = cos t + cos (2t) defined on the interval, -1 ≤ t ≤ 1.  Which option best describes this function?  A. Even B. Odd C. Neither even nor odd D. Both even and odd

Advanced Engineering Mathematics
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Chapter2: Second-order Linear Odes
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Consider the function:

f(t) = cos t + cos (2t) defined on the interval,

-1 ≤ t ≤ 1. 

Which option best describes this function? 
A. Even
B. Odd
C. Neither even nor odd
D. Both even and odd 

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