If ("cos"(x-y))/("cos"(x+y))+("cos"(z+t)...

If `("cos"(x-y))/("cos"(x+y))+("cos"(z+t))/(cos(z-t))=0` , then the value of expression `tanxtanytanztant` is equal to (a)`1` (b) `-1` (c)` 2` (d) `-2`

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