Question

state the sign of cos 820°







​

Answer 1

Answer:

Negative

Step-by-step explanation:

Cos 180 is cos(4π+100) ie second quadrant where cos is negative... Hope it helps

Answer 2

The sign of cos 820° is negative

Step-by-step explanation:

cos 820°

it is equal to

= $- \sin (\frac{\pi}{18} )$

therefore ,

value of cos 820° is -0.1736.. (approximately )

also ,

it lies in  second quadrant where cos is negative

hence , the sign of cos 820° is negative

#Learn more:

State the sign of the following

tan 380 and cos 820​

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