If Tan(A)=n Tan(B) and Sin(A)=m Sin(B)
Then,
Prove that
Cos²(A)=m²-1 n²-1
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If Tan(A)=n Tan(B) and Sin(A)=m Sin(B)
Then,
Prove that
Cos²(A)=m²-1 n²-1
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