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Range of Trigonometric Ratios from 0 to 90 Degrees

Solve: cosx...

Question

Solve: $cos \frac{x}{3} - 1 = 0$

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Solution

$c o s \frac{x}{3} - 1 = 0$
$c o s \frac{x}{3} = 1$
$c o s \frac{x}{3} = c o s 0$
$\frac{x}{3} = 0$
$x = 0^{\circ}$

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