3 years ago

What shod be in the box 3/10 × (box)=1

Mathematics

1 answer:

Novay_Z [31]3 years ago

5 0

Answer:

0.333333333

Step-by-step explanation:

0.333333333×0.3=1

3/10=0.3

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(6x + 7) - (9x + 9) simpilest form pls

My name is Ann [436]

Answer:

-3x+16

Step-by-step explanation:

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3 years ago

Read 2 more answers

(sin x)(tan x cos x - cot x cos x) = 1 - 2 cos2x

Aliun [14]

As

$\tan x=\dfrac{\sin x}{\cos x}$
$\cot x=\dfrac{\cos x}{\sin x}$

we have

$\sin x(\tan x\cos x-\cot x\cos x)=\sin x\left(\sin x-\dfrac{\cos^2x}{\sin x}\right)=\sin^2x-\cos^2x$

Recalling that $\cos2x=\cos^2x-\sin^2x$ , we end up with

$-\cos2x=1-2\cos2x$
$1=\cos2x$
$\implies2x=2n\pi$

(where $n$ is any integer)

$\implies x=n\pi$