सभी theta in R के लिए S = (sin^(2) theta...

सभी `theta in R` के लिए `S = (sin^(2) theta + cos^(4) theta)` है, तो

(i) `(13)/(16) le S le 1`

(ii) `1 le S le 2`

(iii) `(3)/(4) le S le (13)/(16)`

(iv) `(3)/(4) le S le 1`

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