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Question

If cos245ocos230o=x.cos45o.sin45o then x=______.

A
12
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B
32
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C
2
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D
34
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Solution

The correct option is A 12
cos245ocos230o=x.cos45o.sin45o
(12)2(32)2=x(12)(12)
1234=x2

234=x2

14=x2

x=12

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