Are the following true or false & why?
cos(-175°) = cos(175°)
cos(32°) = sin(58°)
sin(π/3) = 1/sec(π/3)
cos(2π/3) = cos(4π/3)

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first one is true because cosine is even

that is to say
\[\cos(x)=\cos(-x)\]

hello anwar

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