Whoa? Is it?
Geometry
Level
3
sec x * cos x = ?
cosx
may be 0 or 1
undefined
1
sin x
0
may be 1 or undefined
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Sec X * cos X = cos x/cos x = 1, however, we cant divide by zero which is when x = π/2 for cos x, so hence it can be 1 or undefined.