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3 years ago

Pls help and no links thankyou <3

Mathematics

1 answer:

Hitman42 [59]3 years ago

8 0

Do the second one hope this helps

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zubka84 [21]

Answer:

See Explanation Below

Step-by-step explanation:

Given

$(sin x - cos x)^2 = sec^2x - tan^2x - 2sinx.cos x.$

Required

Prove

To start with; we open the bracket on the left hand side

$(sin x - cos x)^2 = (sin x - cos x)(sin x - cos x)$

$(sin x - cos x)^2 = (sin x )(sin x - cos x)- (cos x)(sin x - cos x)$

$(sin x - cos x)^2 = sin^2 x -sinx cos x - sin xcos x + cos^2 x$

$(sin x - cos x)^2 = sin^2 x -2sinx cos x + cos^2 x$

Reorder

$(sin x - cos x)^2 = sin^2 x + cos^2 x - 2sinx cos x$

From trigonometry;

$sin^2x + cos^2x = 1$

So;

$(sin x - cos x)^2 = sin^2 x + cos^2 x - 2sinx cos x$

becomes

$(sin x - cos x)^2 = 1 - 2sinx cos x$

Also from trigonometry;

$sec^2x - tan^2x = 1$

So,

$(sin x - cos x)^2 = 1 - 2sinx cos x$

becomes

$(sin x - cos x)^2 = sec^2x - tan^2x - 2sinx cos x$

Proved

3 0

3 years ago

Alfonso has 435 stamps in his collection. He wants to collect at least 815 stamps. Write and

Lyrx [107]

Answer:

x= 361

Step-by-step explanation:

7 0

3 years ago

What is the slope intercept form of 10x + 2y =8

antoniya [11.8K]

Slope intercept form is: y = mx + b

Isolate the y. First subtract 10x from both sides

10x (-10x) + 2y = 8 (-10x)

2y = -10x + 8

Isolate the y. Divide 2 from both sides and <em>all</em> terms.

(2y)/2 = (-10x + 8)/2

y = -5x + 4

y = -5x + 4 is your slope intercept form answer.

hope this helps

7 0

3 years ago

In a video game, Bob can score 3 points (x) or 4 points (y) by hitting targets. To win the game he must score at least 20 points

MariettaO [177]

Well,

we know that we need to accumulate points from x and y to reach 20 points.

since x provide 3 and y provide 4 points, the formula would be :

3x + 4y = 20

or it can be written as :
y = (3x/4)+5

hope this helps

6 0

3 years ago

Read 2 more answers

Find the missing side of the triangle !!!<br> HELP MEEE!!!!!!!!!!!!!!

Mila [183]

The answer would be 10

7 0

3 years ago