Trigonometry
posted by Anonymous .
Write cos(83degrees) as a function of a positive angle
Prove that tan^2(alpha)1+cos^2(alpha)=tan^2(alpha)sin^2(alpha)

since cos(x) = cos(x), what do you think?
cos(x) = cos(0x)
= cos0*cosx  sin0*sinx
= 1*cosx  0
= cos(x)
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