The Y-Intercept of the cosine function is X = 0, Y = cosine(0) = 1.
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Yes. The cosine function is continuous. The sine function is also continuous. The tangent function, however, is not continuous.
The cosine function on a right triangle is Adjacent leg divided by the hypotenuse of the triangle.
The negative sine graph and the positive sine graph have opposite signs: when one is negative, the other is positive - by exactly the same amount. The sine function is said to be an odd function. The two graphs for cosine are the same. The cosine function is said to be even.
The basic circular functions are sine, cosine and tangent. Then there are their reciprocals and inverses.