Skip to Content

Converting Secant to x Using a Right Triangle

Home | Calculus 2 | Trigonometric substitution | Converting Secant to x Using a Right Triangle

Convert x=secθx = \sec\theta back in terms of xx using a right triangle and basic SOHCAHTOA.

This problem is about expressing a trigonometric identity in terms of another variable using geometric visualization with a right triangle. The first step in approaching such problems is understanding the identity being used. Here, you are given x equals secant thetax \text{ equals secant theta}, which is a foundational trigonometric relationship. Secant is the reciprocal of cosine. To convert secant back into terms involving xx through a right triangle, consider secant as the ratio of the hypotenuse to the adjacent side of a right triangle.

By drawing a triangle, you visualize secant theta as hypotenuse over the adjacent side relative to the angle theta. A good approach involves labeling the sides of the triangle accordingly and using basic trigonometric identities or Pythagorean theorem to express other aspects of the triangle. This type of problem exemplifies how geometric interpretation can aid in simplifying or reworking expressions involving trigonometric functions.

In essence, solving this problem doesn't only reinforce an understanding of trigonometric functions and their relationships, but it also demonstrates the utility of alternative mathematical perspectives, like geometric representations, to solve algebraic problems. Visualizing the problem through a triangle also provides a clearer insight into why these trigonometric relationships hold, fostering a deeper understanding of the mathematics involved.

Posted by grwgreg 21 days ago

Related Problems

Simplify and integrate the expression (x2+9)3/2(x^2 + 9)^{3/2} using trigonometric substitution where x=3tan(θ)x = 3\tan(\theta).

Evaluate the integral dtt2+9\displaystyle \int \frac{dt}{t^2 + 9} using trigonometric substitution.

For a radical x21\sqrt{x^2 - 1}, use trigonometric substitution and translate sinθ\sin\theta back to xx in the problem solved.

Integrate using sine substitution where the substitution is x=6sin(θ)x = 6 \sin(\theta).