2 years ago

I need hlep wite my homwok i am 7 years old whayt is 2x2

Mathematics

2 answers:

monitta2 years ago

8 0

Answer:

Step-by-step explanation:

katrin [286]2 years ago

8 0

Answer:

Step-by-step explanation:

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The distance between R and T on the coordinate grid is ___ units. (Input whole numbers only.)

gogolik [260]

15 units of distance. So 15

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2 years ago

100 Points and Brainly.

user100 [1]

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Find x-intercept :

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(-x) = 6

x = -6

Find y-intercept :

y = (-0) - 6

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3 years ago

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3 years ago

Show that cos(3x) = cos3(x) − 3 sin2(x)cos(x). (Hint: Use cos(2x) = cos2(x) − sin2(x) and the cosine sum

otez555 [7]

Step-by-step explanation:

To prove:

$\cos 3x=\cos^3x-3\sin^2 x\cos x$

Identities used:

$\cos(A+B)=\cos A\cos B+\sin A\sin B$ ......(1)

$\sin 2A=2\sin A\cos A$ ........(2)

$\cos 2A=\cos^2A-\sin^2 A$ .......(3)

Taking the LHS:

$\Rightarrow \cos 3x=\cos (x+2x)$

Using identity 1:

$\Rightarrow \cos (x+2x)=\cos x\cos 2x-\sin x\sin 2x$

Using identities 2 and 3:

$\Rightarrow \cos x(\cos ^2x-\sin^2 x)-\sin x(2\sin x\cos x)\\\\\Rightarrow \cos^3x-\sin^2x\cos x-2\sin^2 x\cos x\\\\\Rightarrow \cos^3x-3\sin^2x\cos x$

As, LHS = RHS

Hence proved

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3 years ago