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Tangent repeats every 180 degrees, so Tan(180 + a) = tan(a). This site has several useful identities.
http://www.mathwords.com/t/trig_identities.htm

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7y ago
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7y ago

tan(180 + a) = tan(a).

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Q: Tan 180 plus a
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Find the value of tan 180 plus 15?

For tan(180 degrees), this is simply sin(180 degrees)/cos(180 degrees). To find these values, note that 180 degrees is the leftmost point on the unit circle, at y=0, x=-1, so is tan(180 degrees)=0/-1=0. Then adding 15 gives 15.


What is 180 plus 180 plus 180 plus 180 plus 180 plus 180 plus 180 plus 180?

8 x 180 = 1,440


How do you find the value of tan 135?

tan(135) = -tan(180-135) = -tan(45) = -1


How do you calculate trigonometric ratios of obtuse angles?

If ø is an obtuse angle then (180 - ø) is an acute angle and: sin ø = sin (180 - ø) cos ø = -cos (180 - ø) tan ø = -tan (180 - ø)


What is periodical in reference to math?

It is used when a function takes the same values after some fixed interval, and multiples of that interval. For example, tan(x) = tax(x + 180) = tan(x + 360) = tan(x + n*180) for all integer values of n. So tan is said to be periodic, with period 180 degrees (or π radians).


Tan 9 plus tan 81 -tan 27-tan 63?

tan(9) + tan(81) - tan(27) - tan(63) = 4


What 180 plus 124?

180 plus 124 = 304


What are the six trigonometric functions of 180 degrees?

sin(180) = 0 cos(180) = -1 tan(180) = 0 cosec(180) is not defined sec(180) = -1 cot(180) is not defined.


What is tan20 tan31 plus tan32 tan38 plus tan 38 tan 20?

It is approx 0.9725


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The tangent function is a periodic function with period 180 degrees sotan(360) = tan(360-2*180) = tan(0) = 0.


What is a plus 3a plus 5a equals 180?

a + 3a + 5a = 180 9a =180 a = 20


Tan 9-tan 27-tan 63 plus tan81 equals 4?

4