What is Tan 40 ° - cot 40 degrees | Math enthusiast | Mathematical art

What is Tan 40 ° - cot 40 degrees

tan40°-cot40°
=[(sin40°)^2-(cos40°)^2]/(sin40°cos40°)
=-2cos80°/sin80°
=-2cot 80 ° (or = - 2tan 10 °)

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