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Murljashka [212]

3 years ago

11

SOS ANSWERRRRR PLZZZZZ

1 answer:

Karo-lina-s [1.5K]3 years ago

7 0

The answer would be A 20c/d

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

denis-greek [22]

Answer:

<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.

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

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

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

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

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

∴ L.H.S. = R.H.S. (Proved)

3 0

3 years ago

If sales tax in a specific county is 6.5% what is the total price paid on a purchase of $156.00

olasank [31]

Then, it would be 156 + 156*6.5 /100 = 156+10.14 = $166.14

8 0

3 years ago

Which of the following statements is true?

mariarad [96]

Answer:

Sedimentary rocks usually form in visible layers

Step-by-step explanation:

A is wrong because not all igneous rock is formed by pressure

B is wrong because sedimentary rock is usually a surface rock

C is wrong because the rock cycle is sporadic and doesn't always end in igneous rock

D is correct because sedimentary rock is formed from years and years of sediment layering on top of each other

8 0

3 years ago

Read 2 more answers

What is the area of a quadrilateral ABCD, if AB = 5 cm, BC = 13 cm, CD = 9 cm, DA = 15 cm, AC = 12 cm?

Setler [38]

<span>ABCD is a quadrilateral with angle ABC a right angle. The point D lies on the perpendicular bisector of AB. The coordinates of A and B are (7, 2) and (2, 5) respectively. The equation of line AD is y = 4x − 26. find the area of quadrilateral ABCD</span>

4 0

3 years ago

FC is the diameter of the circle. What is the measure of arc FAD?

Naya [18.7K]

Answer:

$arc\ FAD=223^o$

Step-by-step explanation:

we know that

The diameter divide a circle into two equal parts

so

The measure of arc FAC is equal to 180 degrees (Remember that a complete circle subtends a central angle of 360 degrees)

we have that

$arc\ AB=arc\ CD$ ---> given problem

$arc\ AB=m\angle AGB$ ----> by central angle

$m\angle AGB=43^o$ ----> given problem

so

$arc\ AB=arc\ CD=43^o$

therefore

$arc\ FAD=arc\ FAC+arc\ CD$ ----> by angle addition postulate

substitute

$arc\ FAD=180^o+43^o=223^o$

8 0

3 years ago