3 years ago

Is 28 square foot rational

Mathematics

1 answer:

erik [133]3 years ago

3 0

Answer:

Yes.

Step-by-step explanation:

A rational number is a number that is a result when you divide two integers.

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?/15•3/5=1/25 what does ? equal.

elena-14-01-66 [18.8K]

Answer:

? = 1

Step-by-step explanation:

5 0

3 years ago

Csc^3x-csc^2x-cscx+1=cot^2x(cscx-1)

belka [17]

Verify the identity:

$csc^3x-csc^2x-cscx+1\qquad =cot^2x(cscx-1)\\\\csc^2x(cscx-1)-1(cscx-1) =\quad \downarrow\\\\(csc^2x-1)(cscx-1)\quad \qquad \ =\quad \downarrow\\\\\bigg(\dfrac{1}{sin^2x}-\dfrac{sin^2x}{sin^2x}\bigg)(cscx-1)\ =\quad \downarrow\\\\\\\bigg(\dfrac{1-sin^2x}{sin^2x}\bigg)(cscx-1)\qquad \ =\quad \downarrow\\\\\\\bigg(\dfrac{cos^2x}{sin^2x}\bigg)(cscx-1)\qquad \qquad =\quad \downarrow\\\\\\cot^2x(cscx-1)\qquad \qquad \qquad =cot^2x(cscx-1)\qquad \checkmark$