3 years ago

Cos72cos130+sin72sin130

Mathematics

1 answer:

Setler [38]3 years ago

3 0

Answer:

.5299192646

Step-by-step explanation:

Just plug it in a calculator

You might be interested in

4x – 8 Please helppp

Nadya [2.5K]

-2

Divide each term (-4x = 8 by -4)

Cancel the common factor of -4

x = 8/-4

THEN DIVIDE

x=-2

4 0

3 years ago

Which of the following numbers is rational but not an integer A.0 B.3 C.-9 D.-4.3

Mashutka [201]

Answer:

Thus, every integer is a rational number. Clearly, 3/2,-5/3, etc. are rational numbers but they are not integers. Hence, every integer is a rational number but a rational number need not be an integer.

Step-by-step explanation:

7 0

3 years ago

aleksandr82 [10.1K]

Answer:

x=67

y=40

The angles equal 63 and 117

Step-by-step explanation:

88% sure

5 0

3 years ago

What is the value of (8 – 3)!? A. 336 B. 40,314 C. 5 D. 120

Tom [10]

Anything that is inside the perenthasis are just like a regular math problem, so your answer should be:
C. 5

5 0

4 years ago

Read 2 more answers

(x-1)^2+(2-x)^2-3(x-5)*(x-5)

Natali5045456 [20]

Answer:

$-x^2+24x-70$

Step-by-step explanation:

$(x-1)^2+(2-x)^2-3(x-5)*(x-5)\\=> (x - 1)^2 + (2 - x)^2 - 3(x - 5)^2\\=> x^2 - 2x + 1 + 4 - 4x + x^2 - 3(x - 5)^2\\=> x^2 - 2x + 5 - 4x + x^2 - 3(x - 5)^2\\=> x^2 - 6x + 5 + x^2 - 3(x - 5)^2\\=> 2x^2 - 6x+5 - 3(x - 5)^2\\=> 2x^2 - 6x+5 - 3(x^2 - 10x + 25)\\=> 2x^2 - 6x+5 - 3x^2+30x-75\\=> -x^2 - 6x + 5 + 30x - 75\\=> -x^2 + 24x + 5-75\\=> -x^2+24x-70$

Formula used =

$(a-b)^2 = a^2+ 2ab + b^2$

8 0

3 years ago