please help me to prove this question
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Use formula
cos(A-B)= cosAcosB+ sinAsinB
sin(A-B)= sinAcosB-cosAsinB
Open all brackets and you will see that everything will get cancelled out and answer =0
cos(A-B)= cosAcosB+ sinAsinB
sin(A-B)= sinAcosB-cosAsinB
Open all brackets and you will see that everything will get cancelled out and answer =0
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