$\sqrt{1+ cos 0 d 0} $ is equal t...
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sqrt{1+ cos 0 d 0} is equal to

JEE/Engineering Exams
Physics
Solution
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@sqrt{1+cos 0} =  sqrt{1+2cos20/2-1}

@sqrt{1cos} .do  sqrt{2.cos0/2 .do}

√2[sin0/2]/1/2+c

=2√2.sin0/2+c

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