sin 5.x cos 5x ERCISE & Prove that: X (1) cos(A+B)+cos(A-B)=2 cos Acos B cosy+sin y cos.x+sinx *(3) Prove that: cos(x+y)-sin(x-y) cos 2x K (1) sin 3x=3sin.x-4 sin³.r Prove that: (1) cos Sacos 30+ sin 3a sin 5α cosa-sina Prove that X (3) * (1) cos 5.x-cos 15x=2sin 10x sin 5x sin 48-sin 20 cos 40+ cos20 =tane (4) = cosa+sina (2) 164 (2) (23

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