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Without using tables, evaluate the following: sec30° cosec60° + cos60° sin30°. - Mathematics

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प्रश्न

Without using tables, evaluate the following: sec30° cosec60° + cos60° sin30°.

बेरीज
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उत्तर

sec30° cosec60° + cos60° sin30°.

cos30° = `sqrt(3)/(2)`

⇒ sec30° = `(2)/sqrt(3)`

sin60° = `sqrt(3)/(2)`

⇒ cosec60° = `(2)/sqrt(3)`

cos60° = `(1)/(2) , sin30° = (1)/(2)`

sec30° cosec60° + cos60° sin30°

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

= `(4)/(3) + (1)/(4)`

= `(16 + 3)/(12)`

= `(19)/(12)`.

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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 1.02
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