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If 2tan10^0+t a n 50^0=2x ,\ "tan"20^0+"...

If `2tan10^0+t a n 50^0=2x ,\ "tan"20^0+"tan"5060=2"y","\ "2"tan"10^0+"tan"7060=2"w\ and\ tan"20^0+"tan"70^0=2"z",` then which of the following is/are true. a.`z > w > y > x` b. `\ w=x+y` c.`\ 2y=z` d. `z+x=w+y`

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