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2 years ago

5

Tina brought some nail polish and lip gloss at the store.The nail polish costs $4.50 per bottle and lip gloss costs $7 per tube.

tina brought 9 items and spent $50.50.how many of each item did she buy

1 answer:

tatiyna2 years ago

8 0

The answer to the question.

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Prove that:- (1-sinA)(1+sinA)÷(1+cosA)(1-cosA)=cot^2A

astraxan [27]

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identity

sin²x + cos²x = 1 , then

sin²x = 1 - cos²x and cos²x = 1 - sin²x

Consider the left side

$\frac{(1-sinA)(1 + sinA)}{(1+cosA)(1-cosA)}$ ← expand numerator/denominator using FOIL

= $\frac{1-sin^2A}{1-cos^2A}$

= $\frac{1-(1-cos^2A)}{1-(1-sin^2A)}$

= $\frac{1-1+cos^2A}{1-1+sin^2A}$

= $\frac{cos^2A}{sin^2A}$

= cot²A = right side , thus proven

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2 years ago

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SCORPION-xisa [38]

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3 years ago

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vitfil [10]

Answer:

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Step-by-step explanation:

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