If a -cos-cos-sin-sin-cos y - b -cos-sin-sin-cos-cos- and c -sin-sin y then a 2- b 2- c 2 is equal toA- -1B- 0C- None of theseD- 1

The correct option is D 1 a^2+b^2+c^2=cos^2 α (cos^2 β + sin^2 β)+sin^2 α cos^2 α (sin^2 α+cos^2 β)+sin^2 α sin^2 γ=1 ...

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Product of Trigonometric Ratios in Terms of Their Sum

If a =cosαcos...

Question

$I f a = c o s α c o s β + s i n α s i n β c o s γ, b = c o s α s i n β - s i n α c o s β c o s γ a n d c = s i n α s i n γ t h e n a^{2} + b^{2} + c^{2} i s e q u a l t o$

-1

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None of these

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