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Question

If cos245ocos230o=x.cos45osin45o then x= ................

A
-1/2
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B
1/2
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C
2
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D
3/4
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Solution

The correct option is A -1/2
cos245ocos230o=xcos45osin45o
(12)2(32)2=x×12×12
1234=x2
14=x2
x=12

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