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AlexFokin [52]
3 years ago
8

Cho tam giác ABC vuông tại A < góc B=a chứng minh: a) 1+

le="tan^{2}" alt="tan^{2}" align="absmiddle" class="latex-formula">a=\frac{1}{sin^{2}a }
làm giúp mình với
Mathematics
1 answer:
dimaraw [331]3 years ago
8 0
<h3><u>L</u><u>H</u><u>S</u><u>:</u><u>-</u></h3>

\\ \sf\longmapsto 1+tan^2A

\boxed{\sf tanA=\dfrac{sinA}{cosA}}

\\ \sf\longmapsto 1+\dfrac{sin^2A}{cos^2A}

\\ \sf\longmapsto \dfrac{cos^2A+sin^2A}{cos^2A}

\boxed{\sf cos^2A+sin^2A=1}

\\ \sf\longmapsto \dfrac{1}{cos^2A}

\\ \sf\longmapsto \dfrac{1}{1-sin^2A}

\\ \sf\longmapsto \dfrac{1}{1}-\dfrac{1}{sin^2A}

\\ \sf\longmapsto \dfrac{1}{sin^2A}

Hence verified

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The Present value of an annuity is given by PV = P(1 - (1 + r/t)^-nt)/(r/t)
where: P is the monthly payment, r is the annual rate = 7% = 0.07, t is the number of periods in one year = 12 and n is the number of years = 3.

18,000 - 6,098 = P(1 - (1 + 0.07/12)^-(3 x 12)) / (0.07/12)
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2 years ago
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A is 7 4 and 3..B is the same...This is my first time with this kind of problem....
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3 years ago
Explain your reasoning for your answer above. <br><br> I’ll give brainliest !!
Juliette [100K]

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Step-by-step explanation:

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5 0
2 years ago
Does someone know this? :)
kvv77 [185]

Answer:

Your answer would be

- 2/25 x^3a^3

Or vice versa with the variables

- 2/25 a^3x^3

TO solve it’s pretty simple if you do it correctly.

So with all the variables in the two multiples, you can find a way to combine them

So ignoring everything else you’d get

a^2x * x^2a

You we can see the difference,

theres a^2 and a

Whilst there is also x^2 and x

Now we can combine them

a^3 x^3

Now we can do the normal multipacation with the fraction

2/5 * - 1/5 which is -2/25

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ANd you got it :D

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Answer:

1. C.

2. A.

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2 years ago
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