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Range of Trigonometric Ratios from 0 to 90 Degrees

Solve: 2cos...

Question

Solve: $2 cos (3 x - 15^{0}) = 1$

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Solution

$2 c o s (3 x - 15) = 1$
$c o s (3 x - 15) = \frac{1}{2}$
$c o s (3 x - 15) = c o s 60$
$3 x - 15 = 60$
$3 x = 75$
$x = 25^{\circ}$

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