Question

find the value of x if
$\cos{4x - 10degree} = 0$
​

Answer 1

Answer:

$\cos(4x - 10 \degree) = 0 \\ \\ \therefore \: \cos(4x - 10 \degree) = \cos \: 90 \degree \\ \\ \therefore \: 4x - 10 \degree = 90 \degree \\ \\ \therefore \: 4x = 90 \degree + 10 \degree\\ \\ \therefore \: 4x = 100 \degree \\ \\ \therefore \: x = \frac{100 \degree }{4} \\ \\ \huge \orange{ \boxed {\therefore \: x = 25 \degree}}$