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Math

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1)Use the definitions sin0(theta) = y/r, cos0(theta) = x/r and/or tan0(theta) = y/x to prove that
cot0(theta) = 1/tan0(theta)

2)For all 0(theta) prove:
a)cos(t) = 1/sec0(theta)
b. sec(t) = 1/cos0(theta)

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