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# Trigonometry – Proving Questions Are Good!

(4)
Tuition given in the topic of A-Maths Tuition Questions from the desk of at 7:11 pm (Singapore time)

Updated on

Proving questions are good.
Proving questions are important.
Proving questions helps you remember the formulas.
So don’t be lazy and don’t always skip the proving questions in your homework!

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### Revision Exercise

To show that you have understood what Miss Loi just taught you from the centre, you must:

1. kiroii commented in tuition class

2007
Sep
26
Wed
4:14pm

1

ok tis q wasted 20mins of my life-.- its simply silly>.

2. kiroii commented in tuition class

2007
Sep
26
Wed
4:16pm

2

er..zz got canceled

let a be cot x
and cosec^2 x = 1+ cot^2 x

hence after subing it becomes
(1-a^2) / (1 +a^2 + 2a)

=(1-a) (1+a) / (a+1) (a+1)

= (1-a) / (a+1)
hence after doin mumbo jumpo = solved

3. Miss Loi Friend Miss Loi on Facebook @MissLoi commented in tuition class

2007
Sep
28
Fri
4:52pm

3

Kiroii,

Substituting your trigo identity cosec2x = 1 + cot2x, you'll get:

=

Factorizing:

=

Now here are the 'mumbo jumpo' parts you're too lazy to write down! (marks may be deducted in exams for insufficient workings - esp for proving questions!)

Substituting cot x = , you'll get:

=
=

So where's the silliness that wasted 20mins of your life??? Tsk.

4. kiroii commented in tuition class

2007
Sep
28
Fri
11:27pm

4

de silliness is in my lack of experience..din memorise the whole trigeometry formulas thus wasted quite some time staring thinking of an explicable method..but once i refered to my textbook..w00t brainstorm LOL rather silly?

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