How to find angle value with sign quickly ( An Advance maths Trick For SSC CGL 2016 and RRB )

Its just 2 step method. Let's learn this trick
First learn this sentence .

ADD SUGAR TO COFFEE.
    I.      II.        III       IV
Here



ADD means .. All Sin , cos, tan are positive in First quadrant.

SUGAR means .. Sin ( cosec also..because just reciprocal  ) .. is positive is second quadrant.

TO means ... Tan ( cot also) ..  is positive is third quadrant .

Last one

COFFEE means ...cos ( sec also.) ..is positive is fourth quadrant .

Now Apply this trick
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Example 1 .. Find Tan(405°)

First divide angle by 360 and take only remainder
= reminder (405/360) = 45

Now see Angle 45 is in first quadrant . In first quadrant Tan is positive as( all are positive as ADD,see above sentence)
We got + sign here
This reminder is for checking sign only
Now for angle value
= remainder(405/90)
=45

So we have + sign and have angle value 45 in tan
=+tan(45)
=+1 ( answer)
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Example 2
Find the value of Sin(840)
For sign
=reminder ( 840/360)
=120
120 is in second quadrant and in second quadrant all the positive (SUGAR means sin and cosec +)
We got + sign
Again

For value
=Reminder(840/90)
=30
So sin( 840)=+sin(30)
=1/√2 (answer )
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Categories: maths, railway, RRB, Short Tricks, SSC cgl 2016