sir help me with this sum i am not getting the LHS=RHS
Tan-11/4 + tan-12/9 = ½ cos-1 3/5
To prove: Tan-11/4 + tan-12/9 = ½ cos-1 3/5
or 2(Tan-11/4 + tan-12/9) = cos-1 3/5
Proof:
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sir help me with this sum i am not getting the LHS=RHS
Tan-11/4 + tan-12/9 = ½ cos-1 3/5
To prove: Tan-11/4 + tan-12/9 = ½ cos-1 3/5
or 2(Tan-11/4 + tan-12/9) = cos-1 3/5
Proof: