Trigonometry Problems: The maximum value of Sin4θ + Cos4θ

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The maximum value of Sin4θ + Cos4θ is ?

Solution

Sin4θ + Cos4θ = (Sin2θ + Cos2θ)2 − 2Sin2θCos2θ = 1 −...

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If a =2 and b = 3, then (ab + ba)−1 = ?

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