Trignometric Equations Flashcards

1
Q

sin(A+B)= ?

A

sin(A+B)=sin A cos B+ cos A sin B

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2
Q

sin (A-B)=?

A

sin(A-B)= sin A cos B - cos A sin B

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3
Q

Cos (A+B)=?

A

cos (A+B)= cos A cos B- sin A sin B

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4
Q

Cos ( A-B )= ?

A

Cos (A-B)= cos A cos B + sin A sin B

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5
Q

Sin (2A)=?

A

Sin (2A)= 2 sin A cos A= 2 tan A/ 1+ tan ^ A

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6
Q

Sin (A-B) sin (A+B) =?

A

sin(A-B) sin( A+ B)= sin ^ A - sin ^ B = cos ^ B - cos ^ A

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7
Q

cos 2A=?

A

cos 2A= cos ^A - sin ^ A= 1- tan ^ A/ 1+ tan ^ A

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8
Q

tan 2A= ?

A

tan 2A= 2 tan A/ 1- tan ^ A

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9
Q

2 sin A sin B = ?

A

2 sin A sin B = cos ( A-B ) - cos ( A+B )

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10
Q

sin A + sin B= ?

A

sin A+ sin B= 2 sin A+B/2 cos A-B/2

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11
Q

sin A - sin B = ?

A

Sin A - sin B = 2 sin A-B/2 cos A+B/2

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12
Q

cos A+ cos B=?

A

cos A+ cos B= 2 cos A+B/2 cos A-B/2

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13
Q

cos A- cos B= ?

A

cos A- cos B= - 2 sin A+B/2 sin A-B/2

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14
Q

tan A+ tan B=?

A

tan A+ tan B= sin ( A+B) / cos A cos B

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