हिंदी

Without using trigonometric tables, prove that: cos 81° – sin 9° = 0

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प्रश्न

Without using trigonometric tables, prove that:

cos 81° – sin 9° = 0

प्रमेय
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उत्तर

LHS = cos 81° − sin 9° = 0

= `cos (90^circ - 9^circ) - sin 9^circ`

= `sin 9^circ - sin 9^circ`

= 0

= RHS

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अध्याय 12: Trigonometric Ratios of Some Complemantary Angles - EXERCISE 12 [पृष्ठ ५९०]

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आर.एस. अग्रवाल Mathematics [English] Class 10
अध्याय 12 Trigonometric Ratios of Some Complemantary Angles
EXERCISE 12 | Q 2. (i) | पृष्ठ ५९०
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