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What is the value of 420^ 390^ + (-300^ ) (-330^ ) ?

Options

  1. A0
  2. B1
  3. C2
  4. D-1

Correct answer

B. 1

Step-by-step solution

aligned & (360^ +60^ ) (360^ +30^ )+ (360^ -60^ ) - & . (360^ -30^ ) & = 60^ 30^ + 60^ 30^ & = (60^ +30^ ) & = 90^ =1 aligned

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