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stellarik [79]
3 years ago
12

2×2+5×a3×3-7×2+5×-y​

Mathematics
1 answer:
allochka39001 [22]3 years ago
8 0

Answer:

15a^3 -5y -10

Step-by-step explanation:

Use PEMDAS to simplify and combine like terms

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4 and 1/3+7 and 1/5=4+1/3+7+1/5=4+7+1/3+1/5=11+5/15+3/15=11+8/15=11 and 8/15

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Tan(y)+ cot(y)/csc(y)= sec(y) prove identity
ArbitrLikvidat [17]

[tan(y) + cot (y)]/csc (y)

tan (y) = sin (y)/cos (y)
cot (y) = cos (y)/sin (y)
csc (y) = 1/sin (y).
Now rewrite the expression with the equivalent values

[sin (y)/cos (y) + cos (y)/sin (y) ] / [1/sin (y)]

1st, let's work the Numerator only = [sin (y)/cos (y) + cos (y)].
                  = [(cos² (y) + sin² (y)]/ [cos (y).sin(y)]

or (cos² (y) + sin² (y) = 1, →Numerator = 1/[cos (y).sin(y)]

Denominator = csc (y) = [1/sin (y)], Then:

N/D = 1/[cos (y).sin(y)] / [1/sin (y)] =  [1 x sin (y)]/ [cos (y).sin (y)] = 1/cos (y)

 Or 1/cos (y) = sec (y) Q.E.D 
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4 years ago
60 POINTS HELPP!!
artcher [175]

Answer:

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Step-by-step explanation:

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6 0
3 years ago
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Step-by-step explanation:

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Step-by-step explanation:

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