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Question Answer
cos(a-b)
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cosa*cosb+sina*sinb
cos(a+b)
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cosa*cosb-sina*sinb
sin(a+b)
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sina*cosb+cosa*sinb
sin(a-b)
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sina*cosb-cosa*sinb
tg(a-b)
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(tga-tgb)/(1+tga*tgb)
tg(a+b)
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(tga*tgb)/1-tga*tgb
sina+sinb
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2sin (a+b)/2 * cos (a-b)/2
sina-sinb
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2sin (a-b)/2 * cos (a+b)/2
cosa+cosb
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2cos (a+b)/2 * cos (a-b)/2
cosa-cosb
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-2sin (a+b)/2 * sin (a-b)/2
sin2x
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2sinx * cosx
cos2x
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2cos2x - 1
tg2x
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2tgx/1-tg2x
ctgx
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1-tg2x/2tgx
ctg(a+b)
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(ctga*ctgb-1)/(ctgb+ctga)
ctg(a-b)
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(ctga*ctgb + 1)/(ctgb-ctga)
sin0
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0
sin30
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1/2
sin45
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(2/2
sin60
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(3/2
sin90
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1
cos0
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1

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