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Novay_Z [31]
3 years ago
7

What is the value of cos A?

Mathematics
2 answers:
Trava [24]3 years ago
7 0

Answer:

Cos A = 3/5

Step-by-step explanation:

Points to remember

<u>Trigonometric ratios </u>

Sin θ  = Opposite side/Hypotenuse

Cos θ = Adjacent side/Hypotenuse

Tan θ = Opposite side/Adjacent side

From the figure we can see a right angled triangle, ABC

AC = 9, CB = 12 and AB = 15

<u>To find the value of Cos A</u>

Cos A = Adjacent side/Hypotenuse

 = AC/AB

 = 9/15  = 3/5

Therefore the value of Cos A = 3/5

Inessa [10]3 years ago
6 0

Answer:

3/5

Step-by-step explanation:

cos A = \frac{AC}{AB}=\frac{9}{15}=\frac{3}{5}

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The sum of the first 3 terms of a geometric series is 171 and the common ratio is 2/3
S_A_V [24]

Answer:

81

Step-by-step explanation:

The formula for calculating the sum of geometric series varies depending on the value of its common ratio.

Given the common ratio to be 2/3 which is less than 1, the formula to be used is given as;

Sn = a(1-rⁿ)/1-r

n is the number of terms of the series

a is the first term

r is the common ratio.

Sn is the sum of the series

Given n = 3, r = 2/3 and Sn = 171,

a= ?

Substituting this values in the formula we have;

171 = a{1-(2/3)³}/1-2/3

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The first term of the series is 81

3 0
3 years ago
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