7. if tan50 = tan40 2tan10 show that

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2 a = 2 tan 10^{\circ} + tan 50^{\circ}

2 b = tan 20^{\circ} + tan 50^{\circ}

2 c = 2 tan 10^{\circ} + tan 70^{\circ}

2 d = tan 20^{\circ} + tan 70^{\circ}

\frac{3 \tan 25 ° \tan 40 ° \tan 50 ° \tan 65 ° - \frac{1}{2} \tan^{2} 60 °}{4 (\cos^{2} 29 ° + \cos^{2} 61 °)}

tan 35^{\circ} tan 40^{\circ} tan 45^{\circ} tan 50^{\circ} tan 55^{\circ}

\frac{sin 18^{\circ}}{cos 72^{\circ}} + \sqrt{3} {tan 10^{\circ} tan 40^{\circ} tan 30^{\circ} tan 50^{\circ} tan 80^{\circ}}

Find the value of tan35°tan40°tan45°tan50°tan55°

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