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Question

If cos135sin145=cos1x then x equal to


A
\N
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B
1
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C
-1
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D
None of these
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Solution

The correct option is B 1

We have
cos135sin145=cos1x
sin1[1a25]sin145=cos1x
sin145sin145=cos1x
cos1x=0x=cos0=1
x=1


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