Trigonometry

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Cosine is 0.766

tan(2x) = 2tanx/(1 - tan2x)

So tan(2x) +1 = 2tanx/(1 - tan2x) + 1

= 2tanx/(1 - tan2x) + (1 - tan2x)/(1 - tan2x)

= (-tan2x + 2tanx + 1)/(1 - tan2x)

Let the sides be abc and their opposite angles be ABC and so:

Using the cosine rule angle A = 67.38 degrees

Using the cosine rule angle B = 67.38 degrees

Angle C: 180-67.38-67.38 = 45.24 degrees

4-5% only know about complex numbers...

(1-cosx)/sinx + sinx/(1- cosx)

= [(1 - cosx)*(1 - cosx) + sinx*sinx]/[sinx*(1-cosx)]

= [1 - 2cosx + cos2x + sin2x]/[sinx*(1-cosx)]

= [2 - 2cosx]/[sinx*(1-cosx)]

= [2*(1-cosx)]/[sinx*(1-cosx)]

= 2/sinx

= 2cosecx

It is f(x) = -x^2.

10.77 inches

aplus(:

sec2 = 1/cos(2) = -2.403 (radians)

Shift = +2

x^2-19x+90

(x-9) (x-10)

tan theta = sqrt(2)/2 = 1/sqrt(2).

Cotangent is a trigonometric function.

It is the reciprocal of the tangent.

Assuming you are referring to degrees; 0.81915

The abscissa.

trivia in trigonomtry

1/60th of a minute.

Almost by definition, tan θ = sin θ / cos θ

You can convert this to sine θ in several ways, for example:

sin θ / cos θ = sin θ / cos (pi/2 - θ)

Or here is another way, using the Pythagorean identity:

sin θ / cos θ = sin θ / root(1 - sin2θ)

Sin 15 + cos 105 = -1.9045

tan 45° = 1

From the given information the value of x works out as 16

I don't know about balaclave, but the name "balaclava" comes from the town of Balaklava in Crimea. During the Crimean War, knitted balaclavas were sent over to the British troops to help protect them from the bitter cold weather.

sin(148) = -0.33833339432428

No, because there is no such thing as a hectagon. Unfortunately there are a few similar words and so it is not possible to guess what you meant.

Perhaps in figuring angles and bevels when installing mouldings or when figuring lengths of rafters in stick building. I personally never got beyond basic algebra in high school(and barely made passing grades) yet I have built hundreds of houses and installed a lot of mouldings at a lot of crazy angles and squared up a lot of foundations just using basic math and a lot of common sense. It might have been easier had I known trig but it sure did'nt seem necessary.