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find the exact value:1. tan[2arccos(-4/5)]2. cos [arcsin(2/3) + 2arcsin(-1/3)]Solve the equations3. sin^2 x +5cos x+2=0 , 0≤x≤2À4. Find all the solutions to 4sin2θ-3cosθ=0please show the complete solutions.thanks... :P
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