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[" (iii) "(1)/(cos(x-a)cos(x-b))=(sin(a-...

[" (iii) "(1)/(cos(x-a)cos(x-b))=(sin(a-b))/(sin(a-b))],[" 30.If "sin alpha sin beta-cos alpha cos beta+1=0" ,prove that "1+cot alpha tan beta=0" ."],[" 1) If "sin alpha sin beta-cos alpha cos beta+1=0" ,prove that "1+cot alpha" tan "beta=0" ."]

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