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Question

If cos1(a)=θ where a ϵ[1,1]then find cos1(a).

A
θ
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B
θ
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C
Doesn't exist
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D
None of these
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Solution

The correct option is D None of these
We have seen that cos1(x) is neither odd nor an even function.& cos1(x)=πcos1for all x ϵ[1,1]cos1(a)=θ(Given)Then,cos1(a)=πcos1(a)Or cos1(a)=πθ

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