Answers edited by David Chi
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How do you identify the axis of symmetry and vertex of
f(x) = -x^2-2x-1
f
(
x
)
=
−
x
2
−
2
x
−
1
?
Question #9c430
How do I verify the following trigonometric identity? 1+sinx/cosx=cosx/1-sinx
Question #a8413