[=(y-x)gt theta],[" 10.If "cos(A+B)sin(C...

[=(y-x)gt theta],[" 10.If "cos(A+B)sin(C+D)=cos(A-B)sin(C-D)," prove "],[" that "cot A cot B cot C=cot D],[" 11.If "tan(A+B)=3tan A" ,prove that "quad " " "]

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