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secondary 4 | A Maths
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How to do this?? I got all the way to cos 50 = sq root 1-a square but the question says that the answer is -ve sq root 1-a sq. Isn’t cos 130 the same as cos 50? Then why did the answer key put cos 130 = negative cos 50 to give a negative answer ?
Date Posted: 9 months ago
Views: 135
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done
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clear
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You remember formula wrong
Date Posted:
9 months ago
Oh I see thanks
:)
done
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key concepts
①【basic angle】
②【butterfly】
130° = 180°-50°
.... believe u can proceed from here
①【basic angle】
②【butterfly】
130° = 180°-50°
.... believe u can proceed from here
Date Posted:
8 months ago
Oh I see thanks ☺️
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