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4 years ago

What is the expanded equivalent of cos(a – b)?

Mathematics

2 answers:

Sergeu [11.5K]4 years ago

7 0

Cos A cos B - sin A sin B
That should be your answer Hope this helps

worty [1.4K]4 years ago

6 0

D. cos a cos b + sin a sin b

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If y = -5, what is the value of 2y+2 - 4

Sonja [21]

Answer:

-12

Step-by-step explanation:

if you use substitution

2*-5+2-4

-10+2-4

-8-4

-12

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3 years ago

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Write an expression that equals (x-13). It must have atleast 2 sets of parentheses and one minus sign. Verify that it is equal t

alekssr [168]

(-X-13)+(X+13)+(X-13)

The positive x and negative x cancel out and equal zero. The positive 13 and negative 13 cancel and equal zero also. Then you are left with (x-13)

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3 years ago

Rewrite the equation by completing the square. x^2 −16x+63=0 (x +{ })^2={ }

Elina [12.6K]

Answer:

(x + 4) ^{2} + 47 = 0

Step-by-step explanation:

$(x ^{2} + 4 ^{2} ) - 4 ^{2} + 63 = 0 \\ (x + 4) ^{2} + 47 = 0$

When completing squares, basing on our equation in the question:

First square the half of 16 e.g (16÷2)^2 = 4^2

Add the result to x^2 and subtract it with 63 e.g the second equation

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4 years ago

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Evgen [1.6K]

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3 years ago

In a group there are 35 girls for every 10 boys. what is the reduced ratio.

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4 years ago