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zimovet [89]
3 years ago
5

What is the value of 2cos^2(75degrees) - 1? Edge

Mathematics
2 answers:
Vinil7 [7]3 years ago
3 0

Step-by-step explanation:

2(cos 75)(cos75) -1

=2(0.6699) -1

=1.3398-1

=0.3398

vredina [299]3 years ago
3 0

Step-by-step explanation:

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3 years ago
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State if the two triangles are congruent. if they are state how you know.
nlexa [21]
1) The triangles are congruent by SSS.

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5 0
3 years ago
(2 thousands 7 tens )÷10 in unit form and standard form is what?
Nutka1998 [239]
<span>1.       </span><span>Given equation = 2 thousands 7 tens / 10.
From this given equation, give the unit form and the standard form
Unit form is the expression where you replace the number with its place values.
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=> 2 hundreds 7 ones – answer in unit form
Standard form is the expression which uses numbers and operators to express an equation.
=> 2 070 / 10
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6 0
3 years ago
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Selena and Drake are evaluating the expression , when . Selena's Work Drake's Work Who is correct and why? Selena is incorrect b
Shtirlitz [24]

Answer:

Selena is correct because she simplified correctly and then evaluated correctly after substituting the values for the variables.

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Step-by-step explanation:

7 0
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1 + 5sin^2x= 7sin^2x solve trig equation. Can you show me how to solve this trig equation?
pantera1 [17]

Answer: x = \frac{\pi}{4}\pm k\frac{\pi}{2}\,\,\,\,\,\,k=\{0,1,2,...\}

Step by step:

1 + 5\sin^2x= 7\sin^2x\\\sin^2 x\rightarrow z\\1 + 5z = 7z\\2z = 1\\z = \frac{1}{2}\implies \sin^2 x = \frac{1}{2}\\|\sin x| = \frac{1}{\sqrt{2}}\\\sin x = \pm\frac{1}{\sqrt{2}}=\pm\frac{\sqrt{2}}{2}\\\implies x = \frac{\pi}{4}\pm k\frac{\pi}{2}\,\,\,\,\,\,k=\{0,1,2,...\}

(Used a table of common angles)

8 0
3 years ago
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