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Prove that: cos2 30° - sin2 30° = cos 60° - Mathematics

प्रश्न

Prove that:

cos² 30° - sin² 30° = cos 60°

योग

उत्तर

`(sqrt3/2)^2 - (1/2)^2 = 3/4 - 1/4 = 2/4 = 1/2 = cos60°`

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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?

Q 3.4 Q 3.3 Q 3.5

अध्याय 23: Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios] - Exercise 23 (A) [पृष्ठ २९१]

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सेलिना Concise Mathematics [English] Class 9 ICSE

अध्याय 23 Trigonometrical Ratios of Standard Angles [Including Evaluation of an Expression Involving Trigonometric Ratios]
Exercise 23 (A) | Q 3.4 | पृष्ठ २९१