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What is 28 times cot 30 - Texas Instruments TI-30XA Calculator

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Use the relation cot(30) =1/tan(30).
Press [DRG] to set the correct angle unit (degree, radian, or grad). If you are working with degrees the DEG display indicator should appear on screen

You then type
28 [/] ( 30 [TAN] ) =

Posted on Aug 31, 2010

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Posted on Jan 02, 2017

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Is it a nice idea to buy a baby travel cot for our 6months little one?


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In. Lbs.

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105

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1 Answer

Ques1...3:28::5:? Ques 2.... 12:30::20:?


Q1: can also be written: 3 = 5
28 x
solving for x;
x = 5*28 = 46.7
3
so 3:28::5:46.7

Q2: can also be written 12 = 20
30 y
solving for y;
y = 30 * 20 = 50
12
so 12:30::20:50

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1 Answer

Calculate 28 cot 30


If you remember that by definition cot(theta)=1/tan(theta) your expression can be calculated as 28/tan(30). Use parentheses if necessary to enclose the whole tan(30) factor.
Before calculating any trigonometric function make sure that the angle unit is set correctly. In your case I presume that 30 means 30 degrees. Use the [DRG] key to cycle through the angle units.

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1 Answer

(1+cotx-cosecx)(1+tanx+secx)=2


I shall attempt :D
1) cosec A + cot A = 3
we know that (cot A)^2 + 1 = (cosec A)^2
Hence, (cosec A)^2 - (cot A)^2 = 1
thus, (cosec A + cot A) (cosec A - cot A) = 1
3 (cosec A - cot A) = 1
(cosec A - cot A) = 1/3

(cosec A - cot A) = 1/3
(cosec A + cot A) = 3
Summing them, 2 cosec A = 3 1/3
cosec A = 6 2/3 = 5/3
sin A = 0.15
Thus, cos A = sqrt (1 - (sin A)^2) = 0.989


2) Prove that (1+tan x - sec x)(1 + cot x + cosec x) =2
expand
LHS= 1 + cot x + cosec x + tan x + 1 + tan x cosec x - sec x - sec x cot x - sec x cosec x
We can calculate that
tan x cosec x = sec x (since tan x = sin x / cos x)
sec x cot x = cosec x
so the above is
LHS = 1 + cot x + cosec x + tan x + 1 + sec x - sec x - cosec x - sec x cosec x
LHS = 2 + cot x + tan x - sec x cosec x
LHS = 2 + cos x / sin x + sin x / cos x - 1 / (sin x cos x)
LHS = 2 + [{cos x}^2 + {sin x}^2 - 1] / (sin x cos x)
LHS = 2 (proved)

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What are the correct tyre pressures for a 2008 Audi A3 1.6 Petrol 5-door hatchback?


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I have a 2007 Audi A3 5 door hatchback Special but no handbook was included when I bought the car. My problem is that I do not know what the tyre pressure should be for this car and having had the car for...


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