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Question: Let the system of equations { x + 5 y − z = 1 4 x + 3 y − 3 z = 7 24 x + y + λ z = μ , λ , μ ∈ R \begin{cases} x + 5y - z = 1 \\[1em] 4x…

❓ Question Find the number of solutions of the equation cos ⁡ 2 θ cos ⁡ θ 2 + cos ⁡ 5 θ 2 = 2 cos ⁡ 3 5 θ 2​ in the interval [ − π / 2 ,   π / 2 …