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Cosine and Sine of the Sum of Two Angles
The formulas for
and
are derived using purely geometric reasoning, avoiding the usual cumbersome algebraic manipulations. Proceed through steps 1–5 to follow the derivation.
Contributed by:
Tomas Garza
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Trigonometric Addition Formulas
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PERMANENT CITATION
Tomas Garza
"
Cosine and Sine of the Sum of Two Angles
"
http://demonstrations.wolfram.com/CosineAndSineOfTheSumOfTwoAngles/
Wolfram Demonstrations Project
Published: July 1, 2011
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Related Curriculum Standards
US Common Core State Standards, Mathematics
HSF-TF.C.9