Hi everyone!

plz help me solve this Compound Angle Formula question:

1. Using Compound Angle Formula, prove that:

cos(y -180°) + sin (y +90°) = 0

plz thxx

(Clapping)(Talking)

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- May 11th 2010, 07:07 AMcoolhackerCompound Angle Formula
Hi everyone!

plz help me solve this Compound Angle Formula question:

1. Using Compound Angle Formula, prove that:

cos(y -*180*°) + sin (y +*90*°) = 0

plz thxx

(Clapping)(Talking) - May 11th 2010, 07:32 AMharish21
- May 11th 2010, 07:37 AMSoroban
Hello, coolhacker!

We are expected to know these formulas:

. .

. .

Quote:

1. Using Compound Angle Formulas, prove that:

. . . . .

We have: .

. .

. .

. .

. . . . . . . . . . . . . . . . . . . .

- May 11th 2010, 07:56 AMcoolhacker
thx u