Trigonometry Examples

$\cos^{2} (x) (1 + \tan^{2} (x)) = 1$

Step 1

Simplify $\cos^{2} (x) (1 + \tan^{2} (x))$ .

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Step 1.1

Rearrange terms.

$\cos^{2} (x) (\tan^{2} (x) + 1) = 1$

Step 1.2

Apply pythagorean identity.

$\cos^{2} (x) \sec^{2} (x) = 1$

Step 1.3

Rewrite $\sec (x)$ in terms of sines and cosines.

$\cos^{2} (x) {(\frac{1}{\cos (x)})}^{2} = 1$

Step 1.4

Simplify the expression.

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Step 1.4.1

Apply the product rule to $\frac{1}{\cos (x)}$ .

$\cos^{2} (x) \frac{1^{2}}{\cos^{2} (x)} = 1$

Step 1.4.2

One to any power is one.

$\cos^{2} (x) \frac{1}{\cos^{2} (x)} = 1$

Step 1.5

Cancel the common factor of $\cos^{2} (x)$ .

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Step 1.5.1

Cancel the common factor.

$\cos^{2} (x) \frac{1}{\cos^{2} (x)} = 1$

Step 1.5.2

Rewrite the expression.

$1 = 1$

Step 2

Graph each side of the equation. The solution is the x-value of the point of intersection.

$x \approx 0, - 0.1, 0.1, \frac{1}{5}, 0.3, \frac{2}{5}, - \frac{1}{2}$

Step 3