TRIG FORMULAE

Question 1

Addition Formula SIN (A + B)

Answer 1

SIN (A + B) = SIN(A)COS(B) + COS(A)SIN(B)

Question 2

Addition Formula SIN (A - B)

Answer 2

SIN (A - B) = SIN(A)COS(B) - COS(A)SIN(B)

Question 3

Addition Formula COS (A + B)

Answer 3

COS (A + B) = COS(A)COS(B) - SIN(A)SIN(B)

Question 4

Addition Formula COS (A - B)

Answer 4

COS (A - B) = COS(A)COS(B) + SIN(A)SIN(B)

Question 5

Addition Formula TAN (A + B)

Answer 5

( TAN(A) + TAN(B) ) / ( 1 - TAN(A) TAN(B) )

Question 6

Addition Formula TAN (A - B)

Answer 6

TAN (A - B) = ( TAN(A) - TAN(B) ) / ( 1 + TAN(A) TAN(B) )

Question 7

SIN (2A) =

Answer 7

2sinAcosA

Question 8

COS (2A) = [COS AND SIN]

Answer 8

Cos²A - Sin²A

Question 9

COS (2A) = [COS]

Answer 9

2Cos²A - 1

Question 10

COS (2A) = [SIN]

Answer 10

1 - 2Sin²A

Question 11

TAN (2A) =

Answer 11

2TanA / 1 - Tan²A