»ï°¢ÇÔ¼ö °ø½Ä¿¡´Â ´ÙÀ½°ú °°ÀÌ ¿©·¯ °¡Áö°¡ ÀÖ½À´Ï´Ù:
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»çÀÎ ÇÔ¼ö(Sine function) °ø½Ä:
sin(A + B) = sin(A)cos(B) + cos(A)sin(B)
sin(A - B) = sin(A)cos(B) - cos(A)sin(B)
sin(2A) = 2sin(A)cos(A)
sin^2(A) + cos^2(A) = 1
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ÄÚ»çÀÎ ÇÔ¼ö(Cosine function) °ø½Ä:
cos(A + B) = cos(A)cos(B) - sin(A)sin(B)
cos(A - B) = cos(A)cos(B) + sin(A)sin(B)
cos(2A) = cos^2(A) - sin^2(A) = 2cos^2(A) - 1 = 1 - 2sin^2(A)
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źÁ¨Æ® ÇÔ¼ö(Tangent function) °ø½Ä:
tan(A + B) = (tan(A) + tan(B)) / (1 - tan(A)tan(B))
tan(A - B) = (tan(A) - tan(B)) / (1 + tan(A)tan(B))
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ÄÚźÁ¨Æ® ÇÔ¼ö(Cotangent function) °ø½Ä:
cot(A) = 1 / tan(A)
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Ãʺ¯È¯ °ø½Ä(co-function) °ø½Ä:
sin(pi/2 - A) = cos(A)
cos(pi/2 - A) = sin(A)
tan(pi/2 - A) = 1 / tan(A)
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