Question

sin18º. cos 36° = 1/4​

Answer 1

$\large \underline{ \bold{ \underline{ \: Remmember : \: \: \: }}}$

$\to$ Sin18° = 0.309

$\to$ Cos36° = 0.809

$\large \underline{ \bold{ \underline{ \: Solution : \: \: \: }}}$

$\to$ Sin18° × Cos36°

$\to$ 0.309 × 0.809

$\to$ 0.249

$\to$ 0.25 ( Rounding Off )

$\to$ 25/100

$\to$ 1/4

Hence Proved