Q.

The expression tan2⁡α+cot2⁡α, is

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a

≥2

b

≥2

c

≥-2

d

none of these

answer is A.

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Detailed Solution

The sum of a positive real number and its reciprocal is always greater than or equal to 2. ∴ tan2⁡α+cot2⁡α≥2.
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