Solving simple trigonometric problems

Find Unknown Sides of Right Angles. Find Height of Object using Trigonometry. Trigonometry Word Problems Videos. Angle of Elevation and Depression.

Calculating sine, cosine, and tangent

Area of Triangle using the Sine Function. Law of Sines or Sine Rule. Law of Cosines or Cosine Rule. Angles at Standard Position and Coterminal Angles. Trigonometric Ratios in the Four Quadrants.

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Finding the Quadrant in Which an Angle Lies. Trigonometric Functions in so,ving Cartesian Plane. Evaluating Trigonometric Functions at Important Angles.

Transformation of Trigonometric Graphs.

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Graphing Sine and Cosine with Different Coefficients. Amplitude, Period, Vertical and Horizontal Shifts. Tangent, Cotangent, Secant, Cosecant Graphs.

Finding a Formula for a Trigonometric Graph. Solving simple trigonometric problems Trigonometric Identities to Simplify Expressions. Sum and Difference Identities. Double-Angle and Half-Angle Formulas.

Simplifying Trigonometric Expressions Involving Fractions. Putting these the two solution sets together, I get the solution for the original equation as being:. This equation is "a quadratic in sine"; that is, the form of the equation is the quadratic-equation format:.

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Since this is quadratic in form, I can apply some quadratic-equation methods. In the case of this equation, I can factor the quadratic:. But the sine is never more than 1so this solving simple trigonometric problems is not solvable; it has no solution. So my complete solution is:. I can use a double-angle identity on the right-hand side, and rearrange and simplify; then I'll factor:.

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So the complete solution is:. I'm really not seeing anything here. It sure would have been nice if one of these trig expressions were squared From the last line above, either sine is zero or else top creative writing programs in florida is zero, so my solution appears to be:.

However and this is important! If you square something, you can't just square-root to get back to what you'd started with, because the squaring may have changed a sign somewhere.

So, to be sure of my results, I need to check my answers in the original equation, to make sure that I didn't accidentally create solutions that don't actually count. Plugging back in, I see:. It's a good thing that I checked my solutions, because two of them don't actually work. They were created by the process of squaring. The answer would have been the same, but I would have needed to account for the solution interval:.

After doing the necessary check because of the squaring and discarding the extraneous solutions, my final answer would have been the same as previously. The squaring trick in the last example above doesn't solving simple trigonometric problems up often, but if nothing else is working, it might be worth a try.

Keep it in mind for the solving simple trigonometric problems test. Page 1 Page 2. Skip to main content. Purplemath Solving trig equations use both the reference angles and trigonometric identities that you've memorized, together with a lot of the algebra solving simple trigonometric problems learned. Just as with linear equationsI'll first isolate the variable-containing term: