Q6 of 90 Page 8

Mark the Correct alternative in the following:
If sin α + sin β = a and cos α – cos β = b, then

sin α + sin β = a

⇒ = a …(I)

cos α – cos β = b

⇒ = b …(II)

Dividing equation (II) by equation (I) –

or,

(Ans)

Mark the Correct alternative in the following:

The value of cos 52^o + cos 68^o + cos 172^o is

Mark the Correct alternative in the following:

The value of sin 78^o – sin 66^o – sin 42^o + sin 6^o is

Mark the Correct alternative in the following:

cos 35^o + cos 85^o + cos 155^o =

Mark the Correct alternative in the following:

The value of sin 50^o – sin 70^o + sin 10^o is equal to

Questions · 90

8. Transformation Formulae

1 2 3 4 5 5 5 5 5 5 5 5 6 7 8 1 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 5 6 6 6 6 6 6 6 7 7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 9 10 11 12 13 14 15 16 17 18 19 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Mark the Correct alternative in the following:If sin α + sin β = a and cos α – cos β = b, then