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labwork [276]
3 years ago
6

Simplify (sinA +cosA) (sinA-cosA) ​

Mathematics
1 answer:
kvv77 [185]3 years ago
5 0

Answer:

-cos(2A)

Step-by-step explanation:

We know that (a+b) (a-b) = a^2-b^2

So it means we can simplify to sin^2(A)-cos^2(A) and we know cos^2(A) - sin^2(A) = cos(2A) but we will just multiply by -1 and we get - cos(2A)

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Find the common difference in the arithmetic sequence where p35 =-9p + 4 and p28 = 5p - 17?
Sphinxa [80]
P(35) = -9p + 4 = -9(35) + 4 = -315 + 4 = -311
p(28) = 5p - 17 = 5(28) - 17 = 140 - 17 = 123

a + 34d = -311
a + 27d = 123

7d = -434
d = -62

Therefore, the commpm difference is -62.
6 0
3 years ago
-x+y-z=17, 4x+3y+z=-10, 2x+y+3z=0
mario62 [17]

Answer:

x = -11, y = 10, z = 4

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stira [4]
Both of them were sold equally. (246)

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4 years ago
Lin and Jen each thought of a number. Lin thought of a 2-digit number. Jen’s number is 7 times as big as Lin’s. But, if Lin writ
FromTheMoon [43]
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What is the solution of this linear system? A. B. C. D. E.
andreyandreev [35.5K]

Answer:

B

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3 years ago
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