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Topic Summary - Math: Rumus Trigonometri

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Rumus Trigonometri yang mungkin bakal dipake di Limit

Sin2a + cos2a = 1
Cos2a = 1 – 2sin2a
Sin (a+b) = sinacosb + cosasinb
Sin (a-b) = sinacosb – cosasinb
Cos (a+b) = cosacosb – sinasinb
Cos (a-b) = cosacosb + sinasinb
2 sina cosb = sin (a+b) + sin (a-b)
2 cosa sinb = sin (a+b) – sin (a-b)
2 cosa cosb = cos (a+b) + cos (a-b)
-2 sina sinb = cos (a_b) – cos (a-b)
sinA + sinB = 2sin ½ (A+B) cos ½ (A-B)
sinA – sinB = 2cos ½ (A+B) sin ½ (A-B)
cosA + cosB = 2cos ½ (A+B) cos ½ (A-B)
cosA – cosB = -2sin ½ (A+B) sin ½ (A-B)

Credit: http://audiographicmemory.blogspot.com/
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