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If sin theta+cos theta=a then sin ^(4) t...

If `sin theta+cos theta=a` then `sin ^(4) theta+cos ^(4) theta=`

A

`1-(1)/(2)(a^(2)-1)^(2)`

B

`1+(1)/(2)(a^(2)-1)^(2)`

C

`(1)/(2)(a^(2)-1)^(2)`

D

`(1)/(2)(a^(2)+1)^(2)`

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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