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What trigonometric ratio of angles from $0 °$ to $90 °$ are not defined?

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tan 90

°, \cot 0 °, cosec 0 ° and sec 90 °

tan

0 °

, cot90

°, cosec 90 ° and sec 0 °

tan

0 °

,cot

30 °, cosec 45 ° and sec 30 °

\tan 90 °, \cot 90 °, cosec 45 ° and sec 45 °

answer is A.

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Detailed Solution

We can draw the trigonometric ratio table for angles

0 °, 30 °, 45 °, 60 ° and 90 ° .

From the table we can find values that are not defined which are:

\tan 90 °, \cot 0 °, cosec 0 ° and sec 90 °

.
Hence required trigonometric ratios are

\tan 90 °, \cot 0 °, cosec 0 ° and sec 90 °

.
So, the correct answer is “Option 1”.

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