![[\sin^2 \theta - (\cos^2 \theta) (\sin^2 \theta)] ^{-1} \\=[\sin^2 \theta \{1- (\cos^2 \theta) \} ] ^{-1} \\=[\sin^2 \theta \times \sin^2 \theta ] ^{-1} \\=[\sin^4 \theta ] ^{-1} \\=[(\sin\theta)^4 ] ^{-1} \\=[(\sin\theta)^4 ] ^{-1} \\=[(\sin 30\degree )^4 ] ^{-1} \\\\=\bigg[\bigg(\frac{1}{2}\bigg)^4 \bigg] ^{-1} \\\\=\bigg[\frac{1}{16}\bigg] ^{-1} \\\\= 16](/tpl/images/0696/1575/c96af.png)
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