Mathematics
Senior High
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A
3
3
(-20) = = cos 2
COS
Point
3
Tсos 20+sinsin 20-sin 20
2
3
ET
sin (-20) = sin cos 20-cos Tsin
₂7 Q(-sin 20, -cos 20) (4, 5)
3
sin 20
2
20 = -cos 20
B
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