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Prove that : cos60° . cos30° - sin60° . sin30° = 0 - Mathematics

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प्रश्न

Prove that : cos60° . cos30° - sin60° . sin30° = 0

बेरीज
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उत्तर

L.H.S. = cos60° . cos30° - sin60° . sin30° 

= `(1)/(2) xx sqrt(3)/(2) - sqrt(3)/(2) xx (1)/(2)`

= `sqrt(3)/(4) - sqrt(3)/(4)`
= 0
= R.H.S.

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पाठ 27: Trigonometrical Ratios of Standard Angles - Exercise 27.1

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फ्रँक Mathematics [English] Class 9 ICSE
पाठ 27 Trigonometrical Ratios of Standard Angles
Exercise 27.1 | Q 3.2
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