This trigonometry video tutorial explains how to calculate the missing side length of a triangle. Examples include the use of the pythagorean theorem, trigo
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It gives you options on what you want to be solved instead of assuming an answer, it's easy to use, and helps get the job done, when I get a math problem or equation that I don't understand I click on the show steps to help guide me into solving it next time.
Really helps with homework,and I love that it explains the steps to you. But, it's a very good app, covers basic maths such as BIDMAS through to differentiation, functions, imaginary numbers etc.