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[" 13सिद्र कीजिए: "],[*(sin(x+y))/(sin(x...

[" 13सिद्र कीजिए: "],[*(sin(x+y))/(sin(x-y))=(tan x+tan y)/(tan x-tan y)]

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tan(x+y)=(tan x+tan y)/(1-tan x tan y)

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