Sum and difference identities help?

B

bestgio

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Jan 27, 2016
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The following relationship is known to be true for two angles A and B:

cos(A)cos(B)-sin(A)sin(B)=0.957269

Express A in terms of the angle B. Work in degrees and report numeric values accurate to 2 decimal places. Be sure your answer is an expression with matching variables.

So I'm pretty lost on how to go on. I do know cos(a+b)=cos(a)cos(b)-sin(a)sin(b). I tried doing arcos(.96) and the math site didn't like my answer. Any ideas?
Thanks in advance!
 
bestgio said:
The following relationship is known to be true for two angles A and B:

cos(A)cos(B)-sin(A)sin(B)=0.957269

Express A in terms of the angle B. Work in degrees and report numeric values accurate to 2 decimal places. Be sure your answer is an expression with matching variables.

So I'm pretty lost on how to go on. I do know cos(a+b)=cos(a)cos(b)-sin(a)sin(b). I tried doing arcos(.96) and the math site didn't like my answer. Any ideas?
Thanks in advance!
Click to expand...

What answer did you provide?
 
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