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Question

The equation is 2 cos1 x+sin1 x=11π6 has
[AMU 1999}


A
No solution
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B

Only one solution

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C

Two solutions

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D

Three solutions

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Solution

The correct option is A No solution

Given equation is (2 cos1 x+sin1 x=11π6
cos1 x+(cos1 x+sin1x)=11π6cos1 x+π2=11π6cos1 x+4π/3
which is not possible as cos1 x ε[0,π]


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