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lara31 [8.8K]
3 years ago
11

How did cos 2x become -cos 2x

Mathematics
1 answer:
Ksju [112]3 years ago
4 0
Cos2x = (cosx)^2-(sinx)^2 so if you have the minus before you have to inverse sign: (sinx)^2-(cosx)^2= -cos2x
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Find the values of X and Y in an isosceles triangle where one angle is 47°
vladimir1956 [14]

Answer:

X and Y = 66.5°.

Step-by-step explanation:

I am assuming that X and Y are the base angles, which are equal in an isosceles triangle.

X = Y = (180 - 47) / 2

=  66.5°.

6 0
2 years ago
Why do whole numbers with an exponent get bigger while fractions with an exponent get smaller.
ohaa [14]

Raising a whole number to a power means: 

             Take (a number of things) a number of times, and then possibly
             take that big number of things a number of times again.

Raising a fraction to an exponent means: 

             Take a piece of (a piece of one thing), and then possibly
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8 0
3 years ago
The gravitational strength on Earth is less than the gravitational strength on Neptune. Which statement is correct?
murzikaleks [220]
The mass of an object will never change no matter what, however, the weight relies on gravity. So therefore, the answer would be D.
5 0
3 years ago
If a car is traveling at 65 miles per hour, then how far does it travel in 2 hours?
frez [133]
65 miles per hour means that for each hour, it goes 65 miles

65 miles*2 hours= 130 miles

Final answer: 130 miles
5 0
3 years ago
Read 2 more answers
A lighthouse casts a shadow 32 meters long at the same time a nearby statue casts a shadow that is 9 meters long. If the statue
Pavlova-9 [17]

Answer:

40

Step-by-step explanation:

Ok, so basically let's start with a proportion.

x/32 = 11.25/9

Cross multiply:

x * 9 = 32 * 11.25

9x = 32 * 11.25

9x = 360

Solving for variable 'x'.

Divide each side by '9'.

x = 40

I don't know if this is the correct answer, but it was based on my math. I hope this helps!

5 0
3 years ago
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