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OpenStudy (anonymous):
Find a possible solution to the equation sin(3x+13)=cos(4x). A. x=-13 degrees B. x=0 degrees C. x=11 degrees D. x-13 degrees
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OpenStudy (welshfella):
just replace x in the equation by the values of x in the options and see which one fots
OpenStudy (welshfella):
* fits
OpenStudy (anonymous):
hint: cos(4x) = sin(90 - 4x)
OpenStudy (anonymous):
still dont get it
OpenStudy (anonymous):
sin(3x+13)=cos(4x) sin(3x+13)=sin(90 - 4x) this implies 3x + 13 = 90 - 4x solve for x
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OpenStudy (anonymous):
x=11
OpenStudy (welshfella):
right
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