A percent is a fraction whose denominator is 100 1.sometimes 2.always 3. never

2 answers:

8 0

2. always

Percents tell us how many parts a certain thing has out of a total of 100 parts; thus, the denominator is always 100.

Valentin [98]3 years ago

7 0

2 always because percentages are always considered a number over 100

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(cos A + cos b)^2 + (sin A + sin B)^2=?

emmasim [6.3K]

First, we expand the equation:

$cos^{2}A+2cosAcosB+ cos^{2}B+sin^{2}A+2sinAsinB+sin^{2}B$

Then, we combine certain terms in order to simplify them using trigonometry identities.

$cos^{2}A+sin^{2}A+cos^{2}B+sin^{2}B+2cosAcosB+2sinAsinB$

Note these identities:
Pythagoran relation: $cos^{2}A+sin^{2}A = cos^{2}B+sin^{2}B=1$
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Thus, if we apply these identities, the simplified equation would be:
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Simplying further, the answer would be

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3 years ago