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If x+y+z = n pi(n=0, +- 1,+-2,...)and (c...

If `x+y+z = n pi(n=0, +- 1,+-2,...)and (cos (y+z))/(cosx)+(cos(x+y))/(cos z)=(2 cos (z+x))/(cos y)`, then show that `tan x+tanx=2tan y`.

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  18. Find all the values of m for which the equation m sin (theta+(pi)/(4))...

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