# Verifying a Trigonometric Identify: cot(pi/2-x)=tanx I am stuck, I used the difference identity for tan, but tan is undefined at pi/2, so would I just substitute the value for cot pi/2 fir tanA in the tan difference formula? Thanks in advance.

Please refer to The Explanation.

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Yes, you can use the difference identity for tangent, but you'll need to handle the issue of cotangent being undefined at π/2. To overcome this, you can rewrite cot(π/2 - x) using the cotangent cofunction identity, which states that cot(π/2 - x) = tan(x). So, cot(π/2 - x) = tan(x). Therefore, the given trigonometric identity is verified.

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