B-2. sin 24° cos 6º-sin 6° sin 66° The value of sin 21° cos 39° -cos 51° sin 69 (1)-1 (2) 1 (4) 0 B-3. 1f270°

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soli) ( left.left.frac{sin 24^{circ} cos 6^{circ}-sin 6^{2} sin 66^{circ}}{sin 21^{circ} cos 39^{circ}-cos 51^{circ} sin 69^{circ}}right|_{2} ^{4}+1right] ) ( =frac{sin 24^{circ} cos 6^{circ}-sin 6^{circ} sin left(90^{circ}-24right)}{sin 21^{circ} cos 39^{circ}-cos (90-39) sin left(90^{circ}-21right)} ) ( =frac{sin 24^{circ} cos 6^{circ}-sin 6^{circ} cos 24^{circ}}{sin 21^{circ} cos 39^{circ}-sin 39^{circ} cos 21^{circ}}=frac{sin (24-6)}{sin (21-39)} ) ( =frac{-sin 18^{circ}}{sin 18^{circ}}=-1, Rightarrow ) of thon (1) is

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