tan 585° . cot 405° + tan 675°
. cot 765°
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Answer:
tan585 = tan(3π+π/4) = 1
cot405 = cot(2π+π/4) = 1
tan675 = tan(4π-π/4) = -1
cot765 = cot(4π+π/4) = 1
(1×1) + (-1×1) = 1-1 = 0
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