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It will be in 3rd Quadrant because cosine and sine both are negative in 3rd Quadrant
There's a mnemonic for this: All Students Take Calculus. Starting in the first quadrant, and moving counterclockwise until the last, give each quadrant the first letter of thos words in order. A represents all 3, s represents sine, t represents tangent, and c represents cosine. If the letter appears in a quadrant, it is positive there. If not, it is negative there.In quadrant 2, only sine is positive.
The differential of the sine function is the cosine function while the differential of the cosine function is the negative of the sine function.
225 degrees
Sine(A+ B) = Sine(A)*Cosine(B) + Cosine(A)*Sine(B).