This following diagram shows that $\displaystyle \sin^2 \theta + \cos^2 \theta = 1$, given $ […]

# Day: January 1, 2021

## Double Angle Formulas

In the Angle Addition Identities post it was shown that $ \displaystyle \sin(x+y) = \sin x \cos […]

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# Day: January 1, 2021

Trigonometry ## The Pythagorean Theorem and the Unit Circle

Trigonometry ## Double Angle Formulas

This following diagram shows that $\displaystyle \sin^2 \theta + \cos^2 \theta = 1$, given $ […]

In the Angle Addition Identities post it was shown that $ \displaystyle \sin(x+y) = \sin x \cos […]

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