Additional Math – Trigonometry – Prove Identities involving Cot A and TanA

$latex \displaystyle \ \frac{{\cot A-\tan A}}{{\cot A+\tan A}}$ $latex \displaystyle (\cot A-\tan A)\div (\cot A+\tan A)$ Change tan A  to [...]

By |2020-02-01T22:04:34+08:00February 1st, 2020|A-Math - Trigonometry|

Additional Math – Trigonometry – The most challenging question we came across – mid year 2019 Exam

While preparing students for the mid year exam 2019, I stumbled upon a very challenging question, I have never came [...]

By |2019-05-16T13:06:55+08:00May 16th, 2019|A-Math - Trigonometry|

Additional Math – Differentiation – Equations with cot x and cosec x

$latex \displaystyle y={{\cot }^{2}}x-5+\cos ecx$ It is difficult to differentiate cot x and cosec x directly. You need to change [...]

By |2018-12-23T11:26:43+08:00December 23rd, 2018|A-Math - Differentiation, A-Math - Trigonometry|

Additional Math – Trigonometry – Prove the Identity Cos x/ (1- Sin x) = Tan x + Sec x

$latex \displaystyle \frac{{\cos x}}{{1-\sin x}}=\tan x + \sec x$ The rule of thumb is to always prove from the side [...]

By |2018-07-09T11:01:24+08:00June 20th, 2018|A-Math - Trigonometry|

Additional Math – Trigonometry – Using the R-Formula to Change a Trigonometric Expression

$latex \displaystyle 10{{\cos }^{2}}x+4{{\sin }^{2}}x+8\sin x\cos x$ Split 10 cos2x and factorize 8sinxcosx. $latex \displaystyle 6{{\cos }^{2}}x+4{{\cos }^{2}}x+4{{\sin [...]

By |2017-11-17T07:33:29+08:00July 3rd, 2017|A-Math - Trigonometry|