[tex] \sin( \alpha ) = \cos(90 - \alpha ) \\ \sin(20 ) = \cos(90 - 20) \\ \sin(20) = \cos(70) [/tex]
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[tex] \sin( \alpha ) = \cos(90 - \alpha ) \\ \sin(20 ) = \cos(90 - 20) \\ \sin(20) = \cos(70) [/tex]