PDF-Exercise2Verifythat1.2cos(x+y)cos(xy)=cos(2x)+cos(2y);2.2sin(x+y)sin(

Author : lindy-dunigan | Published Date : 2015-11-19

ABa ccosAAC ABb candsinBAC ABb ccosBBC ABa cApplyingtheseformulaetotherightangledtriangleABCwherea1bp 3c2weinferthatAhas30degreesor6radiansBhas60degreesor3radiansandChas90degr

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