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3 years ago

8

HELP!! ASAP!!! PLEASE

2 answers:

zlopas [31]3 years ago

4 0

Answer:25

Step-by-step explanation:

xz_007 [3.2K]3 years ago

3 0

Answer:

c

Step-by-step explanation:

just cuz

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marcy guessed the number of hershey kisses in the school jar. since she guessed correctly, she got to keep all of the candy. she

zaharov [31]

Answer:

118.............................

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3 years ago

Complete the comparison : 17>?

sveticcg [70]

Your ans is 1
please tell me if this is correct.

4 0

3 years ago

Trig proofs with Pythagorean Identities.

lorasvet [3.4K]

To prove:

$$\frac{1}{1-\cos x}-\frac{\cos x}{1+\cos x}=2 \cot ^{2} x+1$

Solution:

$$LHS = \frac{1}{1-\cos x}-\frac{\cos x}{1+\cos x}$

Multiply first term by $\frac{1+cos x}{1+cos x}$ and second term by $\frac{1-cos x}{1-cos x}$ .

$$= \frac{1(1+\cos x)}{(1-\cos x)(1+\cos x)}-\frac{\cos x(1-\cos x)}{(1+\cos x)(1-\cos x)}$

Using the identity: $(a-b)(a+b)=(a^2-b^2)$

$$= \frac{1+\cos x}{(1^2-\cos^2 x)}-\frac{\cos x-\cos^2 x}{(1^2-\cos^2 x)}$

Denominators are same, you can subtract the fractions.

$$= \frac{1+\cos x-\cos x+\cos^2 x}{(1^2-\cos^2 x)}$

Using the identity: $1-\cos ^{2}(x)=\sin ^{2}(x)$

$$= \frac{1+\cos^2 x}{\sin^2x}$

Using the identity: $1=\cos ^{2}(x)+\sin ^{2}(x)$

$$=\frac{\cos ^{2}x+\cos ^{2}x+\sin ^{2}x}{\sin ^{2}x}$

$$=\frac{\sin ^{2}x+2 \cos ^{2}x}{\sin ^{2}x}$ ------------ (1)

$RHS=2 \cot ^{2} x+1$

Using the identity: $\cot (x)=\frac{\cos (x)}{\sin (x)}$

$$=1+2\left(\frac{\cos x}{\sin x}\right)^{2}$

$$=1+2\frac{\cos^{2} x}{\sin^{2} x}$

$$=\frac{\sin^2 x + 2\cos^{2} x}{\sin^2 x}$ ------------ (2)

Equation (1) = Equation (2)

LHS = RHS

$$\frac{1}{1-\cos x}-\frac{\cos x}{1+\cos x}=2 \cot ^{2} x+1$

Hence proved.

5 0

3 years ago

(2 x 10) + (9 x 1) + (7 x 1/10) + (8x 1/1000) in standard form

Pepsi [2]

Answer:The number is 209.708

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

In art class,Kerion is coloring a pattern where half of the squares on her paper are being colored blue. Of the blue squares,1/3

stiv31 [10]

To get the fraction of blue squares with stripes we shall proceed as follows;
fraction of blue squares=1/2
1/3 of the blue squares have stripes, therefore we shall have:
fraction of blue square with stripes
=1/3 of 1/2
=1/3×1/2
=1/6
Hence we conclude that the fraction of blue squares with stripes was 1/6 of the total colored squares.

7 0

3 years ago