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Find the reference angle for -240°. 7) Find the reference angle for 7π/4 . By Easy Worksheet. By Easy Worksheet. By Easy Worksheet. 8) Find the reference angle for -150°. 9) Find the reference angle for -π/4 . By Easy Worksheet. By Easy Worksheet. By Easy Worksheet. 10) Find the reference angle for -5π/6. Find the exact value: 11) cos 1140° = ................
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