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114 4 4 ))=0$ 12-14+B)} = A + B) EXAMPLE...

114 4 4 ))=0$ 12-14+B)} = A + B) EXAMPLE 10 Prope that: sin (+1) A sin (n+2) A+ cos (n+1) A cos (n+2) A= COS A INCERT) SOLUTION LHS = sin(n+1) A sin (n + 2) A cos (n + 1) A cos (n + 21 A

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