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Choose the correct answer in each of the following questions: `sin47^(@)cos43^(@)+cos47^(@)sin43^(@)=?`

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Choose the correct answer in each of the following questions:
`sin47^(@)cos43^(@)+cos47^(@)sin43^(@)=?`
A. `sin4^(@)`
B. `cos4^(@)`
C. 1
D. 0
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1 Answer

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Correct Answer - C
Given expression `=sin47^(@)cos(90^(@)-47^(@))+cos47^(@)sin(90^(@)-47^(@))`
`=(sin^(2)47^(@)+cos^(2)47^(@))=1.`
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