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Trig identities practice
Contributed by: Tsygan
__1. 1A. cos2(2x)-sin2(2x)
__2. 1+cos(2x)B. 2sin(3x)cos(3x)
__3. 2cos(5x)C. -sin2(x)
__4. 2sin2(3x)D. 1-cos(6x)
__5. cos(4x)E. cos2(5x)+sin2(5x)
__6. cos(6x)+sin2(3x)F. sin(10x)/sin(5x)
__7. cos(8x)+sin2(4x)G. 2cos2(x)
__8. cos2(x)-1H. cos2(3x)
__9. sin(6x)I. 1-cos2(7x)
__10. sin2(7x)J. 1-sin2(4x)
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