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Len [333]
3 years ago
7

9) 15k + 20 – 10k = 10

Mathematics
1 answer:
Mashutka [201]3 years ago
6 0

Answer:

k=-2

Step-by-step explanation:

You have to bring k itself and make it to a coefficient of 1 using algebra.

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Step-by-step explanation:

This is known as the triple tangent identity.  Start with the fact that the three angles add up to 0.

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Use reflection property:

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