Question 947457
For the following expression, find the value of y that corresponds to each value of x, then write your results as ordered pairs (x, y).
 y = −cos x for x = 0,
f(0) = -cos(0) = -1
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Note:: 
Can't follow the rest of your post.
Cheers,
Stan H.
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π
 2
 , π, 
3π
 2
 , 2π