In a word, no, your heart does not stop when you sneeze. From my
perspective, it is hard to even imagine what this would mean. A sneeze
itself is really a very brief event, occurring in a shorter time then a
heartbeat. Of course, there is the building up to the sneeze (the "ah" of
the "ah-choo"), but the heart certainly does not stop beating because of
this ah-ing. Check your pulse next time to prove this to yourself.
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Cosine and secant are even trig functions.
An even function
There are infinitely many types of functions. For example: Discrete function, Continuous functions, Differentiable functions, Monotonic functions, Odd functions, Even functions, Invertible functions. Another way of classifying them gives: Logarithmic functions, Inverse functions, Algebraic functions, Trigonometric functions, Exponential functions, Hyperbolic functions.
yes
Probably because polynomials and convergent power series in which all terms have even degree are even functions, and similarly for odd.