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What is (\sin^2 \theta-\cos^2 \theta) equal to?(\sin^2 \theta-\cos^2 \theta) किसके बराबर है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (-\cos 2\theta)(-\cos 2\theta)
Because ( \cos 2\theta=\cos^2 \theta-\sin^2 \theta), the given form is (-\cos 2\theta). In exams read double angle identities in reverse too.क्योंकि (\cos 2\theta=\cos^2 \theta-\sin^2 \theta), इसलिए दिया गया रूप (-\cos 2\theta) है। परीक्षा में double angle identities को उल्टा भी पढ़ें।
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