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The equation a cos theta + b sin theta =...

The equation `a cos theta + b sin theta =c` has a solution when a, b anc c are real numbers such that-

A

`a lt b lt c`

B

`a=b =c`

C

`c^(2)lt a^(2) -b^(2)`

D

`c ^(2) le a^(2) +b^(2)`

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The correct Answer is:
D
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