Prove that -1 - sin2 - - sin2 - - sin - - sin - - sin - sin -

Apply a^2 + b^2 + c^2 gt; ab + bc + ca ∵ a^2 + b^2 gt; 2ab, b^2 + c^2 gt; 2bc, c^2 + a^2 gt; 2c ...

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Trigonometric Ratios of Compound Angles

Prove that -1...

Question

Prove that -
1 + $s i n^{2}$ $θ$ + $s i n^{2}$ $ϕ$ > sin $θ$ + sin $ϕ$ + sin $θ$ sin $ϕ$ .

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