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MAXImum [283]
4 years ago
7

SecФ=2 what does Ф= in degrees and in degrees

Mathematics
2 answers:
devlian [24]4 years ago
5 0
SecФ=2 is the same as cosФ=1/2 because sec and cos are inverse functions.
So when solving cosФ=1/2, you need the find the angles where the cos graph equals 1/2. Generally you're supposed to memorize some angle values for your trig functions and this is one of them. The cosine graph is equal to 1/2 when Ф=60° or pi/3 in radians. The answer is also 300° or 5pi/3 radians because cosine is also positive in the fourth quadrant. 

Hope this helps<span />
Dmitry_Shevchenko [17]4 years ago
3 0
Sec <span>Ф = 2

We know, Cos </span>Ф = 1 / Sec <span>Ф
Cos </span><span>Ф = 1/2
</span>Ф = Cos⁻¹ (1/2)
<span>Ф = 60   [ Cos 60 = 1/2 ]

In short, Your Answer would be: 60 degrees

Hope this helps!</span>
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Answer:

The height of the arch at its center is 250/9 or about 27.78 feet.

Step-by-step explanation:

We can write an equation to model the parabolic arch.

Let the left-most point of the arch be the origin (0, 0).

Since the bridge has a span of 100 feet, the right-most point must be (0, 100).

We can use the factored form of a quadratic:

y=a(x-p)(x-q)

Where <em>p</em> and <em>q</em> are the <em>x-</em>intercepts.

Our <em>x-</em>intercepts are <em>x </em>= 0 and <em>x </em>= 100. Hence:

y=ax(x-100)

At a point 40 feet from the center, the height of the arch is 10 feet.

The center is <em>x</em> = 50. So, a point 40 feet from the center can be either <em>x</em> = 10 or <em>x</em> = 90.

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The same value will result if we let <em>x</em> = 90 and <em>y</em> = 10.

Hence, our equation is:

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y(50)=\displaystyle -\frac{1}{90}(50)((50)-100)=\frac{250}{9}\approx 27.78\text{ feet}

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