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3 years ago

5

Evaluate cos^2 (n/12)

1 answer:

77julia77 [94]3 years ago

5 0

Answer:

[(2 + √3)/4] = 0.9330127

Step-by-step explanation:

We know that

cos (pi/12) ^ 2 =

cos (pi/12)* cos (pi/12) =

[(√6 + √2)/4]*[(√6 + √2)/4] =

(0.9659)*(0.9659) = 0.9330127

[(2 + √3)/4] = 0.9330127

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Answer:

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Step-by-step explanation:

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vesna_86 [32]

Answer:

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Step-by-step explanation:

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A rectangular piece of plywood has a diagonal that measures three times the width. The length of the plywood is three feet more

Karolina [17]

Answer:

The length of diagonal is 4.922 feet.

Step-by-step explanation:

Let the width be = w

Let the diagonal be = d

Let the length be = l

Given is that the diagonal measures three times the width, this gives: $d=3w$

Also given is the length of the plywood is three feet more than the width. This is : $l=x+3$

Now, in terms of x we get:

Width = x

Length = (x+3)

Length of Diagonal = 3x

Now applying Pythagorean Theorem

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Solving this we get,

$-7x^{2}+6x+9=0$

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x = 1.64075 or x = -0.783612(neglect this negative value)

So, x = 1.64075 feet

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Step-by-step explanation:

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