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Vinvika [58]
2 years ago
15

Write the value of

- 2 \cos {}^{2} c" alt="1 - 2 \cos {}^{2} c" align="absmiddle" class="latex-formula">


​
Mathematics
1 answer:
enot [183]2 years ago
6 0

Step-by-step explanation:

1-2cos²c.

> (cos²c+sin²c)-2cos²c. (cos²c+sin²c=1)

> cos²c+sin²c-2cos²c

> sin²c-cos²c.

is your correct answer.

hope this helps you.

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Please help! I don't really understand this.
ch4aika [34]

Step-by-step explanation:

11.

Area of rectangle = 408 in²

Length = 3x-2 and width = x

The area of a rectangle is given by :

A = lb

(3x-2)x = 408

x = 12 inch and x = -11.33 in

Neglecting negative value,

The width of rectangle = 12 inch

The length of rectangle = 3x-2 = 3(12)-2 = 34 inch

12.

Base of triangle = 2x+2

Height = x

The area of a triangle is given by :

A=\dfrac{1}{2}bh\\\\600=\dfrac{1}{2}\times (2x+2)x\\\\600=(x+1)x

x = 24 cm and x = -25 cm

Neglecting negative value, x = 24 cm

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8 0
3 years ago
Help!!!!!! I’ve been working on this for 1 hour
kifflom [539]

Answer:

7.83

Step-by-step explanation:

cos(40)=6/(ZX)

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5 0
3 years ago
Students at Mendel Middle School are planning a fair for their school's fundraiser. Liam volunteers to help plan the event. The
FinnZ [79.3K]

Answer:

15 hours

Step-by-step explanation:

x is the number of hours that Liam volunteered in the first month

The next month he volunteered 1\dfrac{2}{3} times the time he volunteered the first month.

Total time he volunteered in the two months is 40 hours so

x+1\dfrac{2}{3}x=40\\\Rightarrow x+\dfrac{5}{3}x=40\\\Rightarrow \dfrac{3x+5x}{3}=40\\\Rightarrow x=\dfrac{40\times 3}{8}\\\Rightarrow x=15

Time he volunteered in the first month is 15 hours.

3 0
2 years ago
Find the scale factor of the dilation shown<br><br> A. 1/2<br> B. 3/2<br> C. 2<br> D. 2/3
AleksandrR [38]

Answer:

B

Step-by-step explanation:

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so \frac{1}{2} x 3 = \frac{3}{2}

8 0
3 years ago
Read 2 more answers
Write and evaluate the expression. Then, complete the statements. Ten less than the quotient of thirty and a number Evaluate whe
Artyom0805 [142]

Answer:

expression:  (30/t) - 10

evaluation:  30/2 - 10 = 5

Step-by-step explanation:

8 0
3 years ago
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