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OpenStudy (anonymous):
If sinxcos(π/7) - sin(π/7) cosx = - √ 2 / 2 , then x can equal: ___________ Check all that apply: 1) π/4 + π/7 + 2nπ 2) 5π/4 + π/7 + 2nπ 3) 7π/4 + π/7 + 2nπ 4) 3π/4 + π/7 + 2nπ
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