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Inga [223]
3 years ago
7

2=6 3=12 4=20 5=30 6=42 9=?

Mathematics
1 answer:
REY [17]3 years ago
4 0
It is a pattern so 2*3=6
3 times 4 is 12
4 times 5 is 20 
5 times 6 is 30
6 times 7 is 42
so, 9 times 8 is 72.

please vote as brainliest
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1+cos2A /1-cos2A=cotA.cotA​
Allisa [31]

Answer:

See Explanation

Step-by-step explanation:

formulae \: to \: be \: used :  \\  \cos 2 \theta = 2 { \cos}^{2}  \theta - 1 \\ and \\ \cos 2 \theta = 1 - 2 { \cos}^{2}  \theta  \\  \\ now \: let \: us \: prove \: the \: given \: trigonometrical \:  \\ identity. \\  \\  \frac{1 +  \cos2A}{1  -   \cos2A}  = \cot \: A. \cot \: A \\ LHS =  \frac{1 +  \cos2A}{1  -   \cos2A}  \\  \\  =  \frac{1 +2 { \cos}^{2}   A- 1 }{1 - (1  - 2 { \sin}^{2}   A)}  \\  \\ =  \frac{1 +2 { \cos}^{2}   A- 1 }{1 - 1   + 2 { \sin}^{2}   A}  \\  \\ =  \frac{2 { \cos}^{2}   A }{2 { \sin}^{2}   A}  \\  \\ =  \frac{{ \cos}^{2}   A }{ { \sin}^{2}   A}  \\  \\  =  { \cot}^{2} A \\  \\  =  { \cot} A .{ \cot} A \\  \\  = RHS \\  \\ hence \: proved.

6 0
3 years ago
What is equivalent expression 9y+y
andrew11 [14]

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4 years ago
Pls help me i will give u brainliest!
Tema [17]

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Step-by-step explanation:

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