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What is the simplified value of 1/(1 + sin x) + 1/(1 - sin x)?

Answer and explanation

Correct answer: 2 sec^2 x

Combine the two fractions using the common denominator (1 + sin x)(1 - sin x). The numerator becomes (1 - sin x) + (1 + sin x) = 2. The denominator is a difference of squares: (1 + sin x)(1 - sin x) = 1 - sin^2 x = cos^2 x. Consequently, the expression simplifies to 2/cos^2 x = 2 sec^2 x, wherever the original denominators are defined. Thus option A is correct. Option C omits the factor 2 from the numerator. Option B incorrectly replaces cos^2 x with sin^2 x, confusing the relevant Pythagorean identity. Option D ignores the surviving denominator entirely. The decisive principle is 1 - sin^2 x = cos^2 x, followed by the reciprocal identity sec^2 x = 1/cos^2 x.

Related tags

MathematicsTrigonometric IdentitiesRational ExpressionsSineTrigonometric Functions And Their PropertiesClass 12 McqTrigonometric Functions

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