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secondary 3 | E Maths
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Anonymous

secondary 3 chevron_right E Maths chevron_right Singapore

Help question 1a

Date Posted: 1 week ago
Views: 9
Eric Nicholas K
Eric Nicholas K
1 week ago
Is this question from an e maths book or an a maths book?

If e maths, this is all you need to know:

sin (180 - x) = sin x
cos (180 - x) = - cos x
tan (180 - x) = - tan x

So for example, sin 110 = sin (180 - 70) = sin 70. This 70 is the acute angle.

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Tan Yi Chen
Tan Yi Chen's answer
5 answers (Tutor Details)
1st
Since angle 110 lies on the 2nd quadrant, the trigo ratio is sin(180-110)