What is the principal solution of sin x = cos x ?

$x = - \frac{π}{6}$

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$x = - \frac{π}{4}$

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$x = \frac{π}{4}$

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$x = \frac{π}{2}$

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Solution

The correct option is C
$x = \frac{π}{4}$

sin x = cos x
tan x = 1
x = $\frac{π}{4}$

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