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If (\tan x+\cot x=5), what is the value of (\tan^2 x+\cot^2 x)?

Answer and explanation

Correct answer: 23

Given \(\tan x+\cot x=5\). Squaring both sides gives \((\tan x+\cot x)^2=\tan^2x+\cot^2x+2\tan x\cot x\). Since \(\tan x\cot x=1\), we get \(25=\tan^2x+\cot^2x+2\). Hence, \(\tan^2x+\cot^2x=23\). Option 25 is only the square of the given sum; the extra 2 must be subtracted. Exam tip: always use \(\tan x\cot x=1\) in such identities.

Related tags

Trigonometric IdentitiesTangentCotangentAlgebraic IdentitiesClass 11 MathematicsTrigonometric Functions And Their PropertiesTrigonometric FunctionsMathematics

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