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expeople1 [14]
2 years ago
15

Evaluate the expression cos(30°)=

Mathematics
2 answers:
Ganezh [65]2 years ago
7 0

Step-by-step explanation:

cos 30° is √3 /2

Also refer to the image attached

<h2><em><u>MARK ME AS BRAINLIST</u></em> </h2>

alina1380 [7]2 years ago
3 0

Answer:

cos (30) =\sqrt{\frac{3}{2} } =0.8660

Step-by-step explanation:

By using the cos square identity in trigonometry i.e., cos2ϴ = 1 – sin2 ϴ, we can evaluate the exact value of cos(33 ). For calculating the exact value of cos(∏/6), we have to substitute the value of sin(30°) in the same formula.

cos(30°) = √1 – sin230°

The value of sin30° is 1/2 (Trigonometric Ratios)

cos(30°) = √1 – (1/2)2

cos(30°) = √1 – (1/4)

cos(30°) = √(1 * 4 – 1)/4

cos(30°) = √(4 – 1)/4

cos(30°) = √3/4

Therefore, cos(30°) = √3/2

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