Question

Prove that :this equation, (iv)

Answer 1

sin18°/ cos72° + {tan10° tan30° tan40° tan50° tan80°}
sin(90-72) / coz72° { tan(90-80) tan(90-60) tan(90-50) tan50° tan80°}
cos72°/ cos72° + { cot80° cot60° cot50° 1/cot50° 1/cot80°}
1 + { 1.1.cot60°}
1+ {1}
1+1
2
hence proved..