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Question

If sin1x=π5, for some x(1,1), then find the value of cos1x

A
3π10
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B
3π10
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C
7π10
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D
7π10
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Solution

The correct option is D 3π10
Using Identity, sin1x+cos1x=π2
cos1x=π2sin1x

=π2π5=3π10

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