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expeople1 [14]
1 year ago
15

Evaluate the expression cos(30°)=

Mathematics
2 answers:
Ganezh [65]1 year 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]1 year 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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Step-by-step explanation:

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Find the circumference of a circle that has a 25-inch radius. Use 3.14 to approximate π.
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\huge \tt \color{pink}{A}\color{blue}{n}\color{red}{s}\color{green}{w}\color{grey}{e}\color{purple}{r }

\large\underline{  \boxed{ \sf{✰\:Important\: point's }}}

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{ \rule{70mm}{2.9pt}}

★ also circumference of a circle is also known as it's perimeter

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{ \boxed{✜\underline{  \boxed{ \sf{\: Circumference \:  of  \: circle= \: 2\pi \: r}}}✜}}

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{ \rule{70mm}{2.9pt}}

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\sf{➛ \: Circumference  \: of  \: circle = 2 \times 3.14 \times 25} \\ \sf{➛ \: Circumference  \: of  \: circle =2 \times 78.5} \\ \sf{➛ \: Circumference  \: of  \: circle =157inch}

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Tpy6a [65]

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<h2>a = - 4.8</h2>

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