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3 years ago

Can someone work this out ? thank you

Mathematics

1 answer:

Anna11 [10]3 years ago

7 0

Answer:

Step-by-step explanation:

(x + y)² - (x - y)² = 4xy

t = a² - b²

= (√8+2)²-(√8-2)² (here, x = √8 & y = 2}

=4*√8*2

=8√8

=8√2*2*2

=8*2√2

=16√2

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I can't figure this out.

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3 years ago

What is the answer to this

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marusya05 [52]

Answer:

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Step-by-step explanation:

Given

I will answer this question using the attached triangle

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In trigonometry:

$Sin \theta =\frac{Opposite}{Hypotenuse}$ and

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So:

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Substitute values for BC and BA

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Substitute values for AC and BA

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In trigonometry:

$Sin \theta =\frac{Opposite}{Hypotenuse}$ and

$Cos \theta =\frac{Adjacent}{Hypotenuse}$

So:

$Sin \angle B =\frac{AC}{BA}$

Substitute values for AC and BA

$Sin \angle B =\frac{6cm}{10cm}$

$Sin \angle B =\frac{6}{10}$

$Sin \angle B =0.60$

$Cos \angle B=\frac{BC}{BA}$

Substitute values for BC and BA

$Cos \angle B=\frac{8cm}{10cm}$

$Cos \angle B=\frac{8}{10}$

$Cos \angle B=0.80$

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$A = 53^{\circ}$

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$Sin(53^{\circ}) =0.80$ -- approximated

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$Cos(53^{\circ}) = 0.60$ -- approximated

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