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Trigonometric Equations

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Given that x = 3sin theta and y = 4cos theta,express x + y in the form
R sin (theta + alpha) giving alpha in radians correct to 4 decimal places
and hence solve the equation, 3sin theta + 4cos theta =1.2
giving your answers in radians in the range -Pi to +Pi

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Solution:
We will add first X and Y, giving:

We divide ...

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