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secondary 3 | E Maths

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Help question 1a

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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