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Use the Fundamental Identities to Find the Value of the Trigonometric

question 114

Multiple Choice

Use the fundamental identities to find the value of the trigonometric function.
-Two sound waves, producing the pressures P1=8sin(460πt) \mathrm { P } _ { 1 } = 8 \sin ( 460 \pi \mathrm { t } ) and P2=6cos(460πt) \mathrm { P } _ { 2 } = 6 \cos ( 460 \pi \mathrm { t } ) , combine on a person's ear drum to produce the pressure P=P1+P2\mathrm { P } = \mathrm { P } _ { 1 } + \mathrm { P } _ { 2 } . Graph P\mathrm { P } in [0.01,0.01,0.001][ - 0.01,0.01,0.001 ] by [20,20,2][ - 20,20,2 ] and use the graph to estimate values for aa and kk so that P=asin(460πt+k) P = a \sin ( 460 \pi t + k ) . Round kk to the nearest ten-thousandth, if necessary.


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