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If 8^(r)=4^(t), what is the value of r t...

If `8^(r)=4^(t)`, what is the value of r to t?

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(a)When R=H
`R=u^(2)sin2theta//g`and `H=u^(2)sin^(2)theta//2g`
`alpha` or `theta=tan^(-1)(4)`
(b)Range value remain same
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