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ArbitrLikvidat [17]
2 years ago
12

Help please I don’t know explain please

Mathematics
1 answer:
steposvetlana [31]2 years ago
4 0

Answer:

4^2 = 16 16/3=5.333 but it should be 16 . if I am wrong so sorry ❤ don't hate me

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Which expression is equivalent to sec^2x − 1? a. cot2x b. tan2x c. csc2x d. cos2x
Nesterboy [21]
Sec^2 x - 1 = tan^2x

Proof:
Sec^2x = 1+ tan^2x

1/cos^2x = 1 + sin^2x/cos^2x

<span>1/cos^2x - sin^2x/cos^2x = 1
</span>Using common denominator:
(1-sin^2x)/cos^2x = 1
sin^2x + cos^2 x = 1
cos^2 x = 1 - sin^2x
Substituting : 
cos^2x/<span>cos^2x = 1
</span>1 = 1
Left hand side = right hand side 
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3 years ago
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x^2 - 14x = -42
x^2 - 14x + 49 = 49 - 42
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x - 7 = (+-) sqrt 7
x = 7 (+-) sqrt 7

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nikitadnepr [17]

Answer:

The difference is subtracting 6.5

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