I In any - ABC- prove that sin B - C -sin B - C - b 2- c 2- a 2ii Prove that cos A cos60- A cos60- A -1-4cos 3 AOr Find the value ofi tan13 -12ii sin 360-iii cos 18-

(i) 2 √(3) (ii) √(10 2√(5))/4 (iii) √(10+√(5))/4 ...

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Sine Rule

i In any Δ AB...

Question

(i) In any $Δ A B C$ , prove that $\frac{s i n (B - C)}{s i n (B + C)} = \frac{b^{2} - c^{2}}{a^{2}}$

(ii) Prove that $c o s A c o s (60^{\circ} - A) c o s (60^{\circ} + A) = \frac{1}{4} c o s 3 A$

Or

Find the value of

$(i) t a n \frac{13 π}{12}$

$(i i) s i n 360^{\circ}$

$(i i i) c o s 18^{\circ}$

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Δ A B C

\frac{sin (B - C)}{sin (B + C)} = \frac{b^{2} - c^{2}}{a^{2}}

In any $Δ A B C,$ prove that

$\frac{s i n (B - C)}{s i n (B + C)} = \frac{(b^{2} - c^{2})}{a^{2}}$

Δ A B C, \frac{b^{2} + c^{2}}{b^{2} - c^{2}} = \frac{sin (B + C)}{sin (B - C)}

\frac{sin (B - C)}{sin (B + C)} = \frac{b^{2} - c^{2}}{a^{2}}

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