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Trig Identities: A Crash Course in Complex Math Concepts

science.howstuffworks.com/math-concepts/trig-identities.htm

Fundamental trigonometric identities, aka trig identities or trigo identities, are equations involving trigonometric functions that hold true for any value you substitute into their variables.

When a baseball player hits a home run, how do they know how far the ball traveled?

entertainment.howstuffworks.com/question704.htm

When Mark McGwire hits a home run, the distance the ball traveled is always announced on the scoreboard and on television a few seconds later. How do they know how far the ball traveled?

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