3 years ago

I will give brainly!!!!±sqrt-38=± simplify plz

Mathematics

1 answer:

vichka [17]3 years ago

3 0

I think it’s 1,2,19,38

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what is the measure of the base angle,x, of the isosceles triangle shown below? round your answer to the nearest tenth of a degr

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Answer:

x ≈ 49.7°

Step-by-step explanation:

Since, the given triangle is an isosceles triangle,

Two sides having measure 17 units are equal.

Opposite angles of these equal sides will be equal.

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By sine rule,

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$\frac{\text{sinx}}{17}=\frac{2(\text{sin}x)(\text{cos}x)}{22}$

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3 years ago

If cosa=1/2(a+1/a), verify that. cos2a=1/2(a²+1/a²)

Alborosie

Answer:

see explanation

Step-by-step explanation:

using the identity

cos2a = 2cos²a - 1 , then

cos2a

= 2[ $\frac{1}{2}$ (a + $\frac{1}{a}$ ) ]² - 1

= 2 [ $\frac{1}{4}$ (a² + $\frac{1}{a^2}$ + 2) ] - 1

= $\frac{1}{2}$ (a² + $\frac{1}{a^2}$ ) + 1 - 1

= $\frac{1}{2}$ (a² + $\frac{1}{a^2}$ ) ← thus verified

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1 year ago