मराठी

Without using trigonometric tables, prove that: cos 54° cos 36° – sin 54° sin 36° = 0

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प्रश्न

Without using trigonometric tables, prove that:

cos 54° cos 36° – sin 54° sin 36° = 0

सिद्धांत
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उत्तर

LHS = cos 54° cos36° - sin 54° sin 36°

= cos (90° - 36°) cos 36° - sin (90° - 360°) sin 36°

= sin 36° cos 36° - cos 36° sin 36°

= 0

= RHS

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

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आर. एस. अग्रवाल Mathematics [English] Class 10
पाठ 12 Trigonometric Ratios of Some Complemantary Angles
EXERCISE 12 | Q 4. (ii) | पृष्ठ ५९०
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