SubArea: Sine, cosine, tangent and cotangentLevel: BProject ID: 9000004801Accepted: 1Clonable: 0Easy: 1In the following list identify an even function.\(y =\cos x\)\(y =\sin x\)\(y =\mathop{\mathrm{tg}}\nolimits x\)\(y =\mathop{\mathrm{cotg}}\nolimits x\)
