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secondary 4 | A Maths
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Thomsas
Thomsas

secondary 4 chevron_right A Maths chevron_right Singapore

Can any kind help me to answer this question?

Date Posted: 3 years ago
Views: 386
Boy Mow Chau
Boy Mow Chau
3 years ago
both are correct ...

using identity (sinx)^2+(cosx)^2=1

-((cosx)^2)/2+c1
= -(1-(sinx)^2)/2+c1
= ((sinx)^2)/2-1/2+c1
= ((sinx)^2)/2+c2 , where c2 = c1-1/2
therefore, the 2 expressions are equivalent.

note that the 2 'c's in the 2 expressions in the question do not represent the same constant.

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Arnold K H Tan
Arnold K H Tan's answer
2178 answers (A Helpful Person)
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Both students are correct.

Author of several O-level Science guide books (my profile pic). My forte is tutoring O-level sciences (Chemistry, Physics, Biology). Telegram Messenger: @ChillXsg Note that only my tuition students have the privilege to direct message questions, to clarify.
Thomsas
Thomsas
3 years ago
Thanks
Arnold K H Tan
Arnold K H Tan
3 years ago
Welcome!