4cos^2x−3=0

4cos^2x−3=0

Question
Trigonometric Functions
asked 2021-03-06
\(\displaystyle{4}{{\cos}^{{2}}{x}}−{3}={0}\)

Answers (1)

2021-03-07
\(\displaystyle{4}{\left({\cos}^{{2}}\right)}{x}-{3}={0}\)
\(\displaystyle{4}{\left({\cos}^{{2}}\right)}={3}\)
\(\displaystyle{\left({\cos}^{{2}}\right)}{x}=\frac{{3}}{{4}}\)
\(\displaystyle{\cos{{x}}}=\frac{{\sqrt{{3}}}}{{2}}\)
\(\displaystyle{x}={{\cos}^{{-{{1}}}}{\left(\frac{{\sqrt{{3}}}}{{2}}\right)}}\)
x=30
0

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