Math, asked by Flame7972, 10 months ago

Find the value of cos (-2220°)

Answers

Answered by RAAGHIB
14

Step-by-step explanation:

To find: Value of cos 2220°

We have,

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]

Answered by swethassynergy
1

The value of cos (-2220°) is \frac{1}{2}.

Step-by-step explanation:

Given:

cos (-2220°).

To Find:

The value of cos (-2220°) .

Formula Used:

cos(-\theta)=cos\theta    --------------formula no.01

cos \ 60\textdegree=\frac{1}{2}

Solution:

As given - cos (-2220\textdegree)

cos (-2220\textdegree)

Applying formula no.01.

=cos (2220\textdegree)

=cos (2160\textdegree+60\textdegree)

=cos (360\textdegree\times6+60\textdegree)

=cos \ 60\textdegree

=\frac{1}{2}

Thus,the value of cos (-2220°) is \frac{1}{2}.

PROJECT CODE#SPJ3

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