some important identities related to sum and differencr of two angles

Sin ( A+B ) = sinA cos B + cosA sinB
Sin ( A-B ) = sinA cos B - cosA sinB
Cos( A +B) = cosA cosB - sinA SinB
Cos ( A - B ) = cosA cosB + sinA sinB
tan(A+B) = tanA+tanB / 1 - tanA tanB
tan(A-B) = tanA - tanB / 1+ tanAtanB
cot (A+B) = cotA cotB - 1 / cotA +cotB
cot (A-B) = cotA cotB +1 / cotB - cotA

Oneday Exams-Medium-Hindi Civil Services Entrance Exams-Medium-Hindi Maths

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