First slide

Trigonometric equations

Question

If $n \in I,$ the line $x = n π + π / 2$ does not intersect the graph of

Moderate

A

$\cot (x + π)$
B

$\cos (x - π)$
C

$\sin x$
D

$\tan x$

Solution

For $x = n π + π / 2, \tan x$ is infinite and all other graphs have finite values.

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