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If `alpha` is any real number, then : `(sinalpha+cosecalpha)^2+(cosalpha+secalpha)^2-(tan^2alpha+cot^2alpha)=....`

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If `alpha` is any real number, then : `(sinalpha+cosecalpha)^2+(cosalpha+secalpha)^2-(tan^2alpha+cot^2alpha)=....`
A. 3
B. `-5`
C. 7
D. `2sin^2alpha+3cos^2alpha`
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Correct Answer - C
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