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3 years ago

How would you verify the trigonometric identity 2x = 2sinx cosx

Mathematics

2 answers:

ad-work [718]3 years ago

7 0

Answer:

Step-by-step explanation:

2x = 2sinx cosx is not an identity. An identity is "always true," whereas a conditional equation is true only for specific value(s) of the unknown. Double check to ensure that you have copied down this problem correctly.

dem82 [27]3 years ago

5 0

Step-by-step explanation:

Hi, there!!

I hope you mean sin2x=2sinx . cosx

so, let's begin in a simple way; by adding, alright:

sin2x= sin(x+x) (as 2x=x+x).

now, let's use compound formula for sin,

so, we get:

sin (x+x)= sinx.cosx + cosx. sinx (as sin(A+B)=sin A. cosB + cosA . sinB)

or, sin (x+x)=2sinx.cosx (adding both).

Therefore, sin 2x = 2sinx. cosx.

Hope it helps..

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Consider this equation: 9x - 7 - 3x + 9 = x + 7 + 5x + 9. How many solutions does this equation have?

garri49 [273]

Final Answer: No Solution. The equation would have 0 solutions.

Steps/Explanations:

Hey there! The answer is No Solution because -7 = 7. If 7 = 7, then it would be true and have one solution, which is not the case here.

Step 1: You should cancel $9$ on both sides.

$9x - 7 - 3x = x + 7 + 5x$

Step 2: Simplify $9x - 7 - 3x$ to $6x - 7$ .

$6x - 7 = x + 7 + 5x$

Step 3: Simplify $x + 7 + 5x$ to $6x + 7$ .

$6x - 7 = 6x + 7$

Step 4: You'll need to cancel $6x$ on both sides.

$- 7 = 7$

Step 5: Since $-7 = 7$ is false, there would be no solution.

No Solution

~I hope I helped you :)~

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Jermiah makes a recipe that calls for 1 1/2 cups of flour and 3/4 stick of butter. If Jermiah uses 3 sticks of butter, how many

xz_007 [3.2K]

Answer:

The answer is 6 cups of flour.

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3 years ago

Whats the area help me youll get brainliest answer

victus00 [196]

Answer:

Step-by-step explanation:

area of rectangle = length × breadth

area of rectangle = 4 × 2

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What is 43.586 rounded to the nearest tenth

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Radda [10]

Hi ;-)

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