sin(3.14/2)cos(3.14/2)+cos(3.14/2)sin(3.14/7)

Express as sin using Sum Difference.
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1 Answer

????????????? angels in radians ??????

& yu want angel=pi/2 ????????????????

pi=180 deg, so pi/2=90deg

sine(90)=1

kosine(90)=0

so sine*kosine=0

2nd term...kosine=0, so it is 0
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