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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle: cos25°cos15°-sin25°sin15°
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OpenStudy (anonymous):
@Jhannybean
OpenStudy (shamim):
the formula is\[\cos(A+B)=cosAcosB-sinAsinB\]
OpenStudy (anonymous):
how do i know to use the cos formula? and not the sine formula?
OpenStudy (shamim):
because ur given equation is\[\cos25\cos15-\sin25\sin15=\cos(25+15)=\cos40\]
OpenStudy (shamim):
medal
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OpenStudy (anonymous):
??
OpenStudy (shamim):
if u r satiisfied then give me a medal
OpenStudy (shamim):
just click best response
OpenStudy (anonymous):
thanks for the help
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