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Q.

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


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a

tan 90°, cot 0°, cosec 0° and sec 90°

b

tan0°, cot90°, cosec 90° and sec 0°

c

tan0°,cot30°,cosec 45° and sec30°

d

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°.
 Question ImageFrom 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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What trigonometric ratio of angles from 0° to 90° are not defined?