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secondary 3 | E Maths
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qaz
Qaz

secondary 3 chevron_right E Maths chevron_right Singapore

how do i find the cosec one ?

Date Posted: 1 week ago
Views: 7

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Justin Ng
Justin Ng's answer
26 answers (Tutor Details)
1st
Hope this helps
qaz
Qaz
1 week ago
hi thanks for your solution , may i ask why is sin(90-a) = cos (a) ? thanks !
Justin Ng
Justin Ng
1 week ago
Hi! That’s because it’s a trigonometric identity where sin (90-x) = cos (x). I’ll attach a picture of the proof
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Justin Ng
Justin Ng's answer
26 answers (Tutor Details)
Here’s the proof!
qaz
Qaz
1 week ago
ohh got it, thanks a lot ! :)