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junior college 1 | H2 Maths
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Calvin Chia
Calvin Chia

junior college 1 chevron_right H2 Maths

Please help ASAP!! Thanks!!

Date Posted: 1 year ago
Views: 93

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Jiayang
Jiayang's answer
1883 answers (Tutor Details)
1st
I think you need to choose the correct formula for cos2A
Wen Guotai Daniel
Wen Guotai Daniel
1 year ago
Jiayang should have evaluate further, get rid of the (1-tanx) below. It's too early to approximate when there is division. Notice it's different from what's given. Good work! Cheers.
Wen Guotai Daniel
Wen Guotai Daniel
1 year ago
Or... should have applied Taylor's series in the first place.
Jiayang
Jiayang
1 year ago
Good qn, what happened to my 3?! Btw, the whole small appx IS from the Taylor series.

@calvin I’ll check again tmr or maybe somebody will help me fix it xD
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Jiayang
Jiayang's answer
1883 answers (Tutor Details)
Made a careless mistake last night...
Wen Guotai Daniel
Wen Guotai Daniel
1 year ago
Very smart solution! To take 2nd order derivative of the whole function will be too tedious. Thanks.
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Mark Thong
Mark Thong's answer
122 answers (Tutor Details)
A more general approach..