[" C-4.If tan "^(2)theta=2tan^(2)phi+1" ...

[" C-4.If tan "^(2)theta=2tan^(2)phi+1" ,then the value of "cos2 theta+sin^(2)phi" is "],[[" (A) "1," (B) "2," (C) "-1," (D) Independent of "phi]]

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