SOLUTION: If <a + <b = 270�, which of the following is equal to cos a? Show all steps. A. Sin a B. Cos a C. Sin B D. Cos B E. -sin B F. -cos a G. -- sin a H. -- cos B

SOLUTION: If <a + <b = 270�, which of the following is equal to cos a? Show all steps. A. Sin a B. Cos a C. Sin B D. Cos B E. -sin B F. -cos a G. -- sin a H. -- cos B

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Question 1011314: If A. Sin a
B. Cos a
C. Sin B
D. Cos B
E. -sin B
F. -cos a
G. -- sin a
H. -- cos B
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If a = 270-b
----
sin(a) = sin(270-b) = sin(270)*cos(b)-cos(270)sin(b) = -cos(b) - 0 = -cos(b)
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Cheers,
Stan H.
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H. - cos B
------
Cheers,
Stan H.
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