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Without Using Trigonometric Tables, Prove That: Cos275° + Cos215° = 1 - Mathematics

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प्रश्न

Without using trigonometric tables, prove that:

cos275° + cos215° = 1

बेरीज
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उत्तर

LHS = cos275° + cos215°

= cos2(`90^circ - 15^circ) + cos^2 15^circ`

 = `sin^2 15^circ + cos^2 15^circ`

= 1 

= RHS

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पाठ 7: Trigonometric Ratios of Complementary Angles - Exercises [पृष्ठ ३१२]

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आर. एस. अग्रवाल Mathematics [English] Class 10
पाठ 7 Trigonometric Ratios of Complementary Angles
Exercises | Q 2.5 | पृष्ठ ३१२
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