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Factorization Method Form to Remove Indeterminate Form

Sin(-420^°)co...

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Sin(-420^°)cos(390^°)+cos(-660^°)sin(330^°)

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sin (- 420^{\circ}) cos (390^{\circ}) + cos (- 660^{\circ}) sin (330^{\circ}) = - 1

.

a

sin (- 420^{\circ}) (cos 390^{\circ}) + cos (- 660^{\circ}) (sin 330^{\circ}) = - a

Q. The value of

sin 420^{\circ} cos 390^{\circ} - cos (- 660^{\circ}) sin 330^{\circ}

Q. The value of

sin 420^{\circ} cos 390^{\circ} - cos (- 660^{\circ}) sin 330^{\circ}

Q. Prove that :

s i n (- 330^{\circ}) c o s (- 300^{\circ}) + s i n (- 420^{\circ}) c o s 390^{\circ} = - \frac{1}{2}

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Factorization Method Form to Remove Indeterminate Form

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