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3 years ago

Which expression is equivalent to 20c - 8d?

Mathematics

1 answer:

bagirrra123 [75]3 years ago

6 0

C.

if you multiply the 4 on each numbers inside of the parentheses then you’ll get ‘20c-8d’

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Ilia_Sergeevich [38]

Answer:

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3 years ago

Which Greek geometer founded a philosophical society that developed its self to the study of mathematics

MA_775_DIABLO [31]

Pythagoras was the Greek Scholar that caused Mathematics

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3 years ago

Find the inverse of f(x)=x/4-7

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Answer:

$fx^{-1} (x)=4x+28$

Step-by-step explanation:

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3 years ago

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Cos (90-theta) • cosec90-theta) =tano. How?

denis-greek [22]

Answer:

______________________________________________________

TRIGONOMETRY IDENTITIES TO BE USED IN THE QUESTION :-

For any right angled triangle with one angle α ,

$\cos (90 - \alpha ) = \sin \alpha$ or $\sin(90 - \alpha ) = \cos\alpha$

$cosec \: (90 - \alpha ) = \sec\alpha$ or $\sec(90 - \alpha ) = cosec\:\alpha$

SOME GENERAL TRIGNOMETRIC FORMULAS :-

$\sin \alpha = \frac{1}{cosec \: \alpha }$ or $cosec \: \alpha = \frac{1}{\sin \alpha }$

$\cos \alpha = \frac{1}{\sec \alpha }$ or $\sec \alpha = \frac{1}{\cos \alpha }$

______________________________________________________

Now , lets come to the question.

In a right angled triangle , let one angle be α (in place of theta) .

So , lets solve L.H.S.

$\cos (90 - \alpha ) \times cosec(90 - \alpha )$

$=> sin\alpha \times \sec\alpha$

$=> \sin\alpha \times \frac{1}{\cos\alpha }$

$=> \frac{\sin\alpha }{\cos\alpha }$

$=> \tan\alpha$ = R.H.S.

∴ L.H.S. = R.H.S. (Proved)

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3 years ago

What is the value of u if 6u =15

tatiyna

6u = 15
u = 15/6
u = 2.5

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3 years ago

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