Posts tagged trig

Posts tagged trig

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1. What is the sector formed by the angle of 240 degrees in a circle with a radius of 5?

(That’s all it says so I’m going to assume that it was asking for the area)

This is my answer: 52.36 square units ( is that correct?).

2. 1/cos(40deg) tan(50deg) - sec(50deg)

I know the answer is 0, but why is it 0?

and

3. why does sin(50deg)/cos(40deg)=1?

1.area f sector is (area of circle with radius r) * (x/360) x is the angle of the sector, if you did this, your answer is correct

2.

( tan50)(1/cos40 ) -sec50

= (tan50)(1/sin50) - sec50………………….. nw you would see how it is 0„„„„„, since cos40 = cos(90-50) = sin50 since cos(90-x) = sin x

3 sin 90-x = cosx

so sin 50 = sin(90-40) = cos 40

so cos 40/cos 40 = 1!!

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sin(a+b) and cos(a+b) proof! =D

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Have you ever been confused by trig functions? This might help them make more sense. My professor showed this to us today and I think I already understand the trig functions better.

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Nail Art / nerdy nails or creative cheating? on We Heart It. http://m.weheartit.com/entry/35965220

(via d-dawnprince)

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sin θ < 0, cos θ > 0. What quadrant is the angle in?

sin θ < 0, means the values of sin must be negative.

cos θ > 0, means the values of cos must be positive.

Create an unlabeled unit circle and check mark the areas where sin θ values are negative and where cos θ values are positive.

The…

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(Source: dovulcantitsdefylogic)

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(Source: mik3ni)

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got messages from followers if they can find the clock that I have used on my blog, well, if anyone wants to have a look, here is the link , strictly no advertising :)