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OpenStudy (anonymous):
cos a + sin a . tan a/2 = 1 prove that and show work pls
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OpenStudy (nincompoop):
show your work
OpenStudy (anonymous):
i am not able to do the first step
OpenStudy (nincompoop):
read your book then
OpenStudy (anonymous):
how can we even change cos a?? and sin a
OpenStudy (anonymous):
there is a theo that cos 2a = 1 - 2 sin a
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