Mathematics: Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a. sin (a -b) = sin a cos b – cos a sin b b. cos (a -b) = cos a cos b – sin a sin b c. cos (a -b) = cos a cosb + sin a sin b d. sin (a + b) = sin a cos b + cos a sin b

Which sum or difference identity would you use

Ответ:

xojade

12.06.2020

The answer to this question is:

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q?
C-"cos (a-b) = cos(a)cos(b) + sin(a)sin(b)."

Hoped this helped, Legendarynikki24
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Ответ:

wendy1538

12.06.2020

Mathematics

The answer is C

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Ответ:

Clivensp5

02.07.2021

Mathematics

ANSWER

(–4 + i) + 4i = –4 + (i + 4i)

EXPLANATION

If a, b, c are real numbers, then

(a + b) + c = a + (b + c)

is the associative property of addition.

Among the given options,

(–4 + i) + 4i = –4 + (i + 4i)

shows the associative property of addition.

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Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a. sin (a -b) = sin a cos b – cos a sin b
b. cos (a -b) = cos a cos b – sin a sin b
c. cos (a -b) = cos a cosb + sin a sin b
d. sin (a + b) = sin a cos b + cos a sin b

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