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If $p → = 3 a → − 5 b →, q → = 2 a → + b →, r → = a → + 4 b →, s → = − a → + b →$ are four nonzero vectors such that $sin p →, q →$ =1 $a n d sin r →, s → = 1 t h e n cos a →, b → i s$

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answer is D.

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Detailed Solution

$p ⊥ q and r ⊥ s ∴ p \cdot q = 0 r \cdot s = 0$

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