Kyle C. answered 08/18/21
Tutor
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Columbia University BA in CS-Math with 6 Years Tutoring Experience
Prove that 1/tanθ = cosθ/sinθ
We know by trig identities that tanθ= sinθ/cosθ.
1/tanθ = 1/(sinθ/cosθ) by the trig identity above
1/(sinθ/cosθ) = cosθ/sinθ by simplification
Thus, 1/tanθ = cosθ/sinθ.