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sin ( 7. Prove that : sin (x- y) tan x tan y 1 (i) sin (x+ y) tan x+ tan y sin (x

sin ( 7. Prove that : sin (x- y) tan x tan y 1 (i) sin (x+ y) tan x+ tan y sin (x + y) (ii) tan x+ tan y %3D sin (x - y) tan x- tan y 13T 8. Evaluate: tan 12

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