1. Prove that the equation is true. cos55*+cos65*+cos175*=0 2. Solve the equation: sin4x+sin2x=sinx
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Hello, blertta! Prove: . Sum-to-product identity: . . . . . . . . . . . . . . . . . . . . .
. So if (You should check as it might be a solution!): . So if (You should check as well!): . You can finish it from here. I hope I didn't make any mistakes.
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