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3 years ago

When do you use trig functions?

Mathematics

1 answer:

Zielflug [23.3K]3 years ago

7 0

When you have all three sides

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Which of the following triangles is an obtuse triangle?

Nikolay [14]

Answer:

First triangle

Step-by-step explanation:

First triangle is the obtuse triangle.

4 0

3 years ago

(cos A + cos b)^2 + (sin A + sin B)^2=?

emmasim [6.3K]

First, we expand the equation:

$cos^{2}A+2cosAcosB+ cos^{2}B+sin^{2}A+2sinAsinB+sin^{2}B$

Then, we combine certain terms in order to simplify them using trigonometry identities.

$cos^{2}A+sin^{2}A+cos^{2}B+sin^{2}B+2cosAcosB+2sinAsinB$

Note these identities:
Pythagoran relation: $cos^{2}A+sin^{2}A = cos^{2}B+sin^{2}B=1$
Sum and Difference Formula/Identities: $cos(A-B) = cosAcosB+sinAsinB$

Thus, if we apply these identities, the simplified equation would be:
$2(cos(A-B))+2$

Simplying further, the answer would be

$2[cos(A-B)+1]$

6 0

3 years ago

If y varies directly as x, find the constant of variation if y = 5 when x = -0.1.

lisabon 2012 [21]

Y=kx......5=0.1k....k=5/0.1.....k=50

3 0

3 years ago

Hong reads 9 3/4 chapters in 3 3/8 hours. What is the unit rate in chapters per hour? Write your answer as a fraction or a mixed

Sav [38]

The unit rate is: $2\frac{8}{9}$ chapters per hour

Step-by-step explanation:

Given

chapters read = $9\frac{3}{4} = \frac{39}{4}$

Time = $3\frac{3}{8} = \frac{27}{8}$

Unit rate is calculated by dividing the total chapters by total time

So,

$Unit\ rate = \frac{\frac{39}{4}}{\frac{27}{8}}\\= \frac{39}{4} * \frac{8}{27}\\= 13 * \frac{2}{9}\\=\frac{26}{9}\\=2\frac{8}{9}$

Hence,

The unit rate is: $2\frac{8}{9}$ chapters per hour

Keywords: Unit rate, fractions

Learn more about fractions at:

#LearnwithBrainly

4 0

3 years ago

Bruno uses a piece of wrapping paper with dimensions 1 and one-fourth feet by 3 feet to wrap a gift. What is the total area of t

8_murik_8 [283]

The area of the paper used to wrap the gift is 3 3/4 square feet

<h3>How to determine the total area?</h3>

The dimension is given as:

1 1/4 by 3

The area is the product of the dimensions.

So, we have

Area = 1 1/4 * 3

Express as an improper fraction

Area = 5/4 * 3

Evaluate

Area = 15/4

Rewrite as:

Area = 3 3/4

Hence, the area of the paper used to wrap the gift is 3 3/4 square feet