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Using four values of theta satisfying th...

Using four values of `theta` satisfying the equation ` 8 cos^(4)theta+15cos^(2)theta-2 = 0` in the interval `(0,4pi)` an arithmetic progression is formed , then

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Using four values of theta satisfying the equation 8cos^4theta+15cos^2theta-2=0 in the interval (0,\ 4pi) , an arithematic progression is formed , then:

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