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ICE Princess25 [194]
3 years ago
6

Find cos(2theta) if cos(theta)= 3/4

Mathematics
1 answer:
yuradex [85]3 years ago
6 0
Sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactly sin(2theta) cos(2theta) tan(2theta) sin(2theta) would it be 2 x (8/17) cos(2theta) would be 2 x (15/17) tan(2theta) would be 2 x (8/17 divided by 15/17) is this correct?
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Answer:

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Step-by-step explanation:

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mr Goodwill [35]

notice, the denominator for each fraction is the same, thus the LCD is just 3.

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klemol [59]

QUESTION 1

The given function is

f(x)=\frac{(x-3)(x-1)}{(x-1)(x+2)}

We simplify to get;

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QUESTION 2

The given function is

f(x)=\frac{5x^2-10x+5}{2x^2-5x+3}

f(x)=\frac{5(x^2-2x+1)}{2x^2-5x+3}

We factor to get;

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f(x)=\frac{x^3-8}{x^2-6x+8}

We factor to get,

f(x)=\frac{(x-2)(x^2+2x+4)}{(x-2)(x+4)}

f(x)=\frac{x^2+2x+4}{x+4}

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D=b^2-4ac

D=2^2-4(1)(4)

D=-12

Hence the equation has no real roots.

The complex roots are

x=-\sqrt{3}i-1 or x=-1+\sqrt{3}i

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3 years ago
Someone plz help i will give brainliest (no links)
WITCHER [35]

Answer:

for part b the answer is 90 degrees

Step-by-step explanation:

2 is adjacent from 5 so they are the same degree number

8 0
2 years ago
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