हिंदी

Evaluate the following: cos 60° cos 45° – sin 60° sin 45°

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प्रश्न

Evaluate the following:

cos 60° cos 45° – sin 60° sin 45°

मूल्यांकन
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उत्तर

cos 60° cos 45° - sin 60° sin 45° …(i)

By trigonometric ratios we know that,

`cos 60^@ = 1/2 cos 45^@ = 1/sqrt2`

`sin 60^@ = sqrt3/2    sin 45^@ = 1/sqrt2`

By substituting above value in (i), we get

`1/2. 1/sqrt2 - sqrt3/2. 1/sqrt2 => (1 - sqrt3)/(2sqrt2)`

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अध्याय 10: Trigonometric Ratios - EXERCISE 10.2 [पृष्ठ १०.२९]

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आर.डी. शर्मा Mathematics [English] Class 10
अध्याय 10 Trigonometric Ratios
EXERCISE 10.2 | Q 2. | पृष्ठ १०.२९
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