Evaluate the value of cot 90 degrees

We need to find the value of cot 90

Solution

As per the trigonometric unit circle, cot (90) = 0

Now will find out using the terms cos and sin

We know that cot x can be expressed in terms of cos and sin as
cot x= cos x / sin x
Hence cot 90= sin 90 /cos 90

As per the values of cos and sin

cos90=0, sin90=1

cot 90= cos 90 / sin 90

cot 90= 0 /1

Therefore cot (90) = 0

Answer

The value of cot 90 = 0

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