मराठी

Evaluate without using a trigonometric table: 3⁢sin⁡32°cos⁡58° +4⁢tan⁡46°cot⁡44° −5⁢sec⁡62°cosec28° - Mathematics

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प्रश्न

Evaluate without using a trigonometric table:

`(3 sin 32°)/(cos 58°) + (4 tan 46°)/(cot 44°) − (5 sec 62°)/("cosec" 28°)`

बेरीज
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उत्तर

Use co-function identities:

cos 58° = sin 32° 

= `(3 sin 32°)/(cos 58°) = 3`

cot 44° = tan(90° − 44°) = tan 46°

= `(4 tan 46°)/(cot 44°) = 4`

sec 62° = `1/(cos 62°) = 1/(sin 28°) = "cosec" 28°`

= `(5 sec 62°)/("cosec" 28°)` = 5

= 3 + 4 − 5    ...[expression equals]

= 2

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पाठ 19: Trigonometry - EXERCISE 19B [पृष्ठ २३३]

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बी निर्मला शास्त्री Mathematics [English] Class 9 ICSE
पाठ 19 Trigonometry
EXERCISE 19B | Q II. 6. | पृष्ठ २३३
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