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How can sec^2 x + cosec^2 x be written in terms of tan x and cot x?

Answer and explanation

Correct answer: 2 + tan^2 x + cot^2 x

The governing concept is the pair of Pythagorean identities sec^2 x = 1 + tan^2 x and cosec^2 x = 1 + cot^2 x. Substitute these two identities into the given sum: sec^2 x + cosec^2 x = (1 + tan^2 x) + (1 + cot^2 x). Combining like terms gives 2 + tan^2 x + cot^2 x. Therefore option B is correct. Option A is missing both constant terms, so it is smaller than the actual expression by 2. Option C uses first powers rather than the squares required by the identities and has no valid derivation here. Option D is also insufficient; tan x cot x may equal 1 where defined, but it cannot represent the complete sum. The identity-based substitution is valid wherever the original functions are defined.

Related tags

MathematicsTrigonometric IdentitiesSecantCosecantTrigonometric Functions And Their PropertiesClass 12 McqTrigonometric Functions

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