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Math Comic #186 - "The Tan Gent" (4-17-15)
There is a significant difference between sin2x and 2sinx.
This page offers notes about double angle identities, as well as formulas, explanations, and practice exercises (with solutions).
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Math Definitions and Formulas | Double Angles from mathwords.com
Free trig identity solver and step-by-step calculator from symbolab.com
Free AlgII/Trig worksheets from kutasoftware.com
Free Trigonometry video lessons and practice tests from Khanacademy.org
Videos: Using Double Angles Identities to Solve Equations | explanations and examples from patrickjmt.com
Math Comic #30 - "Teaching an old dog new tricks" (4-29-12) click lower right to view