tan 60 degree =tan (90 degree_30degree ) = cot ? the answer is 30 degree I need solution​

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How and why T Rstios, Tan(90-A) Tan(90+A) Tan180-A tan 180+A tan 270-A tan 270+A tan 360-A cot 270-A

How and why T Rstios, Tan(90-A) Tan(90+A) Tan180-A tan 180+A tan 270-A tan 270+A tan 360-A cot 270-A

tan 60 degree =tan (90 degree_30degree ) = cot ? the answer is 30 degree I need solution​

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The angle of depression and elevation of the top of a tower 20m high from the bottom of a second tower are 60 degree and 30 degree respectively. What is the height