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Choose the correct answer in each of the following questions: `sec^(2)10^(@)-cot^(2)80^(@)=?`

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Choose the correct answer in each of the following questions:
`sec^(2)10^(@)-cot^(2)80^(@)=?`
A. 1
B. 0
C. `(3)/(2)`
D. `(1)/(2)`
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1 Answer

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Best answer
Correct Answer - A
`sec^(2)10^(@)-cot^(2)80^(@)=sec^(2)10^(@)-cot^(2)(90^(@)-10^(@))=sec^(2)10^(@)-tan^(2)10^(@)=1.`
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