cos (3015°) का मान ज्ञात कीजिए।

  1. 1/√2
  2. √3/2
  3. -1/√2
  4. -√3/2 

Answer (Detailed Solution Below)

Option 3 : -1/√2
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Detailed Solution

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अवधारणा:

cos (2nπ ± θ) = cos θ 

cos (90 + θ) = -sin θ

गणना:

दिया हुआ: cos (3015°)

⇒ cos (3015°)

= cos (360° × 8° + 135°)

= cos (135°)                  [∵ cos (2nπ ± θ) = cos θ ]

= cos (90° + 45°)

= -sin 45°                    [∵ cos (90 + θ) = - sin θ]

= -1/√2

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