6.2 Trigonometric Functions: Unit Circle Approach/78

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Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle \begin{align} &= & &= \\[2ex] &= & &= \\[2ex] \end{align} }