What is sin 9x - sin 2x ?
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=(sin7x+sinx) +sin4x =sin(4x+ 3x) +sin(4x-3x) +sin4x so by using: sin(A+B) + sin(A-B) =2sins. cosB 2sin4x.cos3x+sin4x
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Primary teeth also have shorter, thinner roots than permanent teeth. The biggest difference between primary and permanent teeth is the number. Children usually have 20 primary teeth while adults have 32 permanent teeth, including four wisdom teeth.
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