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krok68 [10]
3 years ago
8

7. x – 5y = 42x + 14 = y​

Mathematics
1 answer:
const2013 [10]3 years ago
4 0
This is your answer.... all you are doing is substituting what ever the variable is

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\sin\theta= \frac{4}{5} &#10;\\&#10;\\\sin^2\theta+\cos^2\theta=1&#10;\\ \cos\theta=\pm \sqrt{1-\sin^2\theta} =\pm \sqrt{1-( \frac{4}{5})^2 } =\pm \sqrt{1- \frac{16}{25} } =\pm \sqrt{\frac{9}{25} }=\pm \frac{3}{5}}

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