Jiayang's answer to Calvin Chia's Junior College 1 H2 Maths question.
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I think you need to choose the correct formula for cos2A
Date Posted:
6 years 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.
Or... should have applied Taylor's series in the first place.
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
@calvin I’ll check again tmr or maybe somebody will help me fix it xD
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