ত্রিকোনমিতির সূত্র
❉ sin(A + B) = sinA.cosB + cisA.sinB
❉ sin(A - B) = sinA.cosB - cisA.sinB
❉ cos(A + B) = cosA.cosB - sinA.sinB
❉ cos(A - B) = cosA.cosB + sinA.sinB
❉ tan(A + B) = tanA + tanB1 - tanA.tanB
❉ tan(A - B) = tanA - tanB1 + tanA.tanB
❉ cot(A + B) = cotA.cotB - 1cotA + cotB
❉ cot(A - B) = cotA.cotB + 1cotB - cotA
❉ sin(A + B).sin(A - B) = sin2A - sin2B = cos2B - cos2A
❉ cos(A + B).cos(A - B) = cos2A - sin2B = cos2B - sin2A
