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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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This trigonometry definition help sheet contains right triangle definitions for sine, cosine, tangent, cosecant, secant, and cotangent. It also contains the unit circle definitions for all trig functions. This sheet describes the range, domain and period for each of the trig functions. There is also a description of inverse trig function notation as well as domain and range.
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eCalc.com
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A discussion of using the tangent function to determine a triangle's hypotenuse.
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Ask Dr. Math
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Explains how to find the basic trig functions of a right triangle.
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Dave's Short Trig Course
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How to solve trigonometric equations.
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SOS Math
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A great site for math worksheets. Includes the best unit circle on the web. You can even request new ones for free!
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Embeddedmath
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The perfect study site for high school, college students and adult learners. Get help to do your homework, refresh your memory, prepare for a test, ....
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SOS math
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Step-by-step solutions to odd-numbered problems from dozens of precalculus textbooks.
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Hotmath
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Step-by-step solutions to odd-numbered problems from dozens of trigonometry textbooks.
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Hotmath
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