हिंदी

Prove the following identities: (sec A – cos A) (cot A + tan A) = sec A tan A

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प्रश्न

Prove the following identities:

(sec A – cos A) (cot A + tan A) = sec A tan A

प्रमेय
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उत्तर

LHS = `(1 / (cos A) - cos A)((cos A)/(sin A) + (sin A)/(cos A))`

= `((1 - cos^2A))/(cos A) xx ((cos^2A + sin^2A))/(sin A cos A)`

= `(sin^2A)/(sin A cos^2A)`

= `(sin A)/(cos^2A)`

= `(1/(cos A) xx (sin A)/(cos A))`

= (sec A tan A) = RHS

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अध्याय 13: Trigonometric identities - EXERCISE 13A [पृष्ठ ६१७]

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आर.एस. अग्रवाल Mathematics [English] Class 10
अध्याय 13 Trigonometric identities
EXERCISE 13A | Q 4. | पृष्ठ ६१७
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