Question

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

Answer 1

Step-by-step explanation:

cos (-1080)

= cos (-1080 + 360 + 360 + 360) (as you can keep adding 360 to the angle without actually changing it)

= cos (0)

= 1

so cos (-1080) = 1