3 years ago

Cot(pi/2-x)/Cosx

1 answer:

5 0

hello :
<span>Cot(pi/2-x)= tanx
</span><span>Cot(pi/2-x)/Cosx = tanx/cosx =tanx ×(1/cosx) = tanx ×secx
</span>because 1/cosx = secx

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hammer [34]

Answer:

Arithmetic sequence

$a_n=\frac{1}{2}-n$ for $n\geq 1$

Step-by-step explanation:

We are given that a sequence

$-\frac{1}{2},-\frac{3}{2},-\frac{5}{2},-\frac{7}{2},...$

We have to identify the sequence as arithmetic or geometric and write an explicit formula .

$a_1=-\frac{1}{2}$

$a_2=-\frac{3}{2}$

$a_3=-\frac{5}{2}$

$a_4=-\frac{7}{2}$

$d_1=a_2-a_1=\frac{-3}{2}+\frac{1}{2}=-1$

$d_2=a_3-a_2=-\frac{5}{2}+\frac{3}{2}=-1$

$d_1=d_2=-1$

When the difference of consecutive terms is constant then the sequence is an arithmetic.

Hence, the sequence is an arithmetic.

$a_n=a+(n-1)d$

$a_n=-\frac{1}{2}+(n-1)(-1)=-\frac{1}{2}-n+1=\frac{1}{2}-n$ for $n\geq 1$

3 0

3 years ago

Morgarella [4.7K]

The only correct answer is "D" 9X-3.

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3 years ago

k0ka [10]

So 30 and 2.5 would be subtracted and added by whatever value. Then divided hope that helped

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4 years ago

Scilla [17]

There are 16 lines between 1 and 2, so each line would be 1/16. The arrow is pointing to the 3rd line so it would be 3/16

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4 years ago

Scilla [17]

C 2,4,5 or 8 because 80 is divisible by all of these numbers

8 0

3 years ago