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3 years ago

11

Help im stressing and crying

2 answers:

Jlenok [28]3 years ago

8 0

I’m so sorry that your upset math makes me cry sometimes too but you just need to push through, and I know it seems hard but I’m sure your a really amazing person and you can do anything you set your mind to!

Now for your answers the answer to the first one is $440

And the second one is 9 times

I hope this helps you!

kramer3 years ago

4 0

The answers should be
1-$280
2-6

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

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<u>______________________________________________________</u>

<u>TRIGONOMETRY IDENTITIES TO BE USED IN THE QUESTION :-</u>

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

<u>SOME GENERAL TRIGNOMETRIC FORMULAS :-</u>

<u></u> $\sin \alpha = \frac{1}{cosec \: \alpha }$ or $cosec \: \alpha = \frac{1}{\sin \alpha }$

<u></u> $\cos \alpha = \frac{1}{\sec \alpha }$ or $\sec \alpha = \frac{1}{\cos \alpha }$

<u>______________________________________________________</u>

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.

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

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

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

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

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∴ L.H.S. = R.H.S. (Proved)

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