Question

Find the value of cos (-2220°)

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Answer 1

Answer:

1/2

Explanation:

Given that–

To find

cos (-2220°) = cos 2220°

[∵ cos(-θ) = cos θ]

= cos [2160 + 60°]

= cos [360° × 6 + 60°]

= cos 60°

[Clearly, 2220° is in Ist Quadrant and the multiple of 360° is even]

= 1/2

[cos 60°=1/2]

Answer 2

Answer:

A ba.se is a compo.und which reacts with hydr.onium ion.s of an a.cid to give s.alt and wa.ter only

Step-by-step explanation:

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