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krok68 [10]
3 years ago
5

Help me please.No spammmers.

Mathematics
1 answer:
egoroff_w [7]3 years ago
5 0

Answer:

C

Step-by-step explanation:

cot =cos/sin =a/b

cos=a/b*sin

(sin-cos)/(sin+cos) =(sin-sin*a/b)(sin+sin*a/b)

=(1-a/b)/(a+a/b)

=(b-a)/(a+b)

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brainly.com/question/17506481

Step-by-step explanation:

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3 years ago
What two numbers add to 9 and multiply to -70
Alborosie
X, y - the numbers

The numbers add to 9 and multiply to -70.
x+y=9 \\
xy=-70 \\ \\
y=9-x \\
xy=-70 \\ \\
\hbox{substitute 9-x for y in the second equation:} \\
x(9-x)=-70 \\
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(-x-5)(x-14)=0 \\
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y=9-x \\
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y=14 \ \lor \ y=-5 \\ \\
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3 years ago
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Answer:

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Step-by-step explanation:

hope this helps

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