Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

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

Answer and explanation

Correct answer: 2 cosec^2 x

Use the common denominator (1 + cos x)(1 - cos x). Adding the numerators gives (1 - cos x) + (1 + cos x) = 2. The denominator simplifies by the difference-of-squares identity: (1 + cos x)(1 - cos x) = 1 - cos^2 x = sin^2 x. Therefore the whole expression is 2/sin^2 x = 2 cosec^2 x, wherever the original denominators are defined. Hence option C is correct. Option A uses the complementary identity in the wrong direction and gives a secant expression instead of a cosecant expression. Option B has the correct trigonometric type but misses the factor 2. Option D incorrectly removes the remaining denominator. The essential reasoning is algebraic combination followed by 1 - cos^2 x = sin^2 x.

Related tags

MathematicsTrigonometric IdentitiesRational ExpressionsCosineTrigonometric Functions And Their PropertiesClass 12 McqTrigonometric Functions

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.