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algol [13]
2 years ago
14

Someone help me please?

Mathematics
2 answers:
AlekseyPX2 years ago
6 0
(r-3)^2 I think this is correct because r^2 means r*r and you are subtracting 9 so I just multiplyed 3*3.
yanalaym [24]2 years ago
4 0
Is a (r + 3) (r - 3)
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Answer:

See below

Step-by-step explanation:

\frac{1}{1-cos A} - \frac{1}{1+cos A} =2 cosec A cot A \\  \\ L. H. S.= \frac{1}{1-cos A} - \frac{1}{1+cos A} \\  \\ = \frac{1+cos A - (1 - cos A)}{(1-cos A)(1+cos A)}\\  \\ = \frac{1+cos A - 1  +  cos A}{1-cos^{2}  A}\\  \\ = \frac{2cos A }{sin^{2}  A}\\  \\ =2 .\frac{1}{sin A}.\frac{cos A }{sin  A}.\\  \\  = 2.cosec \: A.cot \: A \\  \\  = R.H.S

5 0
2 years ago
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wolverine [178]
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7 0
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Jet001 [13]

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4 0
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Semenov [28]
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8 0
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Read 2 more answers
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