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What do you notice?. Double angle formula. . . . Formula and relationships. . Divide by . . . Use the identity . . Replace with . Multiply by -1, make equation equal 0.. Substitute:. Solved using the equation solver.. Only 1 solution as cosx=3.73 is not possible.. First solution from the GDC, second can be calculated as . .

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double angle formulae and solving trig equations


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