Trigonometry Examples

$2 \cos^{2} (\frac{3}{4}) - 1$

Step 1

Apply the cosine double-angle identity.

$\cos (2 (\frac{3}{4}))$

Step 2

Cancel the common factor of $2$ .

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Step 2.1

Factor $2$ out of $4$ .

$\cos (2 \frac{3}{2 (2)})$

Step 2.2

Cancel the common factor.

$\cos (2 \frac{3}{2 \cdot 2})$

Step 2.3

Rewrite the expression.

$\cos (\frac{3}{2})$

$\cos (\frac{3}{2})$

Step 3

The result can be shown in multiple forms.

Exact Form:

$\cos (\frac{3}{2})$

Decimal Form:

$0.07073720 \dots$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$