Question

प्रश्न.8. cos(-1080°) का मान ज्ञात कीजिये ?
अथवा​

Answer 1

Answer:

सिद्ध कीजिए कि sin'a+ sinºß+ sin'y = 2. प्रश्न : (8) SCORdx का मान ज्ञात कीजिए। प्रश्न ..

Answer 2

Answer:

cos(-1080)=cos(1080)=cos0=1

Step-by-step explanation:

In trigonometry, cos is referred to as the cosine of any angle. Some formulae must be followed while solving this type of problem.

Formulae:

cos(90° - A) = sinA

cos(90° + A) = - sinA

cos(180° - A) = - cosA

cos(180° + A) = - cosA

cos(270° - A) = - sinA

cos(270° + A) = sinA

cos(360° + A) = cosA

cos(360° - A) = cosA

cos(- A) = cosA

Step-by-step explanation:

Now, cos(- 1080°)

= cos1080°

= cos (3 * 360°)

= cos360°

= cos(360° + 0°)

= cos0°

= 1, since cos0° = 1

Answer:

The value of cos(- 1080°) is 1.

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