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Question
Evaluate:
`[(4 sin 30°, 2 cos 60°),(sin 90°, 2 cos 0°)] [(4, 5),(5, 4)]`
Solution
`[(4 sin 30°, 2 cos 60°),(sin 90°, 2 cos 0°)] [(4, 5),(5, 4)]`
= `[(4 xx 1/2, 2 xx 1/2),(1, 2xx 1)] [(4,5),(5,4)]`
= `[(2, 1),(1, 2)][(4, 5),(5, 4)]`
= `[(8 + 5,10 + 4),(4 + 10, 5 + 8)]`
= `[(13, 14),(14, 13)]`
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