1.

If a SinA + b cosA = c, then a cosA - b sinA is equal to:

A. \(\sqrt {{a^2} + {b^2} + {c^2}}\)
B. \(\sqrt {{a^2} - {b^2} + {c^2}}\)
C. \(\sqrt {{a^2} + {b^2} - {c^2}}\)
D. \(\sqrt {{a^2} - {b^2} - {c^2}}\)
Answer» D. \(\sqrt {{a^2} - {b^2} - {c^2}}\)


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