tan90^@ is undefined. Since the angle is 90^@, there will be a unit circle instead of a special triangle. Any point at 90^@ can be described as (0, y). However, to make things easier to understand, we will use a radius of 1, meaning the height (y) is also 1. The point will be (0, 1). tan90^@=y/x tan90^@=1/0 tan90^@=undefined tan90^@ is undefined because you can't divide 1 by nothing. This is like saying: 1 divided by 0 is color(red)? rArr color(red)? multiplied by 0 is 1 Nothing multiplied by 0 will give an answer of 1, so the answer is undefined.
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upion: We know: cotAcot25∘cot25∘tan65∘=tan(90∘−A)=tan(90∘−25∘)=tan1=ta..
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