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The trigonometric identity is
given by \PYG{l+s}{\PYGZbs{}(}\PYG{n+nb}{ }\PYG{n+nv}{\PYGZbs{}sin}\PYG{n+nb}{\PYGZca{}}\PYG{l+m}{2}\PYG{o}{(}\PYG{n+nv}{\PYGZbs{}theta}\PYG{o}{)}\PYG{n+nb}{ }\PYG{o}{+}\PYG{n+nb}{ }\PYG{n+nv}{\PYGZbs{}cos}\PYG{n+nb}{\PYGZca{}}\PYG{l+m}{2}\PYG{o}{(}\PYG{n+nv}{\PYGZbs{}theta}\PYG{o}{)}\PYG{n+nb}{ }\PYG{o}{=}\PYG{n+nb}{ }\PYG{l+m}{1}\PYG{n+nb}{ }\PYG{l+s}{\PYGZbs{})}. This identity is also
called the Pythagorean trigonometric identity.
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