हिंदी

Evaluate: Cos2 25° - Sin2 65° - Tan2 45°

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प्रश्न

Evaluate: cos2 25° - sin2 65° - tan2 45°

योग
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उत्तर

cos2 25° - sin2 65° - tan2 45°
= [cos(90° - 65°)]2 - sin2 65° - (tan 45°)2
= sin2 65° - sin2 65° - (1)2
= 0 - 1
= - 1.

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अध्याय 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (F) [पृष्ठ ३३४]

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सेलिना Concise Mathematics [English] Class 9 ICSE
अध्याय 21 Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals]
EXERCISE 21 (F) | Q 3. (iv) | पृष्ठ ३३४
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