Eric Nicholas K's answer to Sonia's Secondary 4 A Maths Singapore question.
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Hi Sonia! Here is a list of the relevant special angles for acute angles which you will need to know for A Maths.
Recognise that the degree form skips 15 and 75. To find the sine, cosine or tangent of these two angles, we will need to use the addition or subtraction angle formula found in your formula list.
Also recognise that the numerators of the radian form are all in pi while the denominators of the radian form are all factors of 12, other than 12 and 1, in decreasing order.
I have tabulated two forms for you. You can follow either form depending on the form which you have learnt and the form which you prefer.
Recognise that the degree form skips 15 and 75. To find the sine, cosine or tangent of these two angles, we will need to use the addition or subtraction angle formula found in your formula list.
Also recognise that the numerators of the radian form are all in pi while the denominators of the radian form are all factors of 12, other than 12 and 1, in decreasing order.
I have tabulated two forms for you. You can follow either form depending on the form which you have learnt and the form which you prefer.
Date Posted:
4 years ago
Thank you so much Eric!!:)
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