白丁 1 可不可以说详细一点 基础很差。。 Dun_Morogh 举人 5 也可以啊,这也是诱导公式 彼岸住民 白丁 1 你把90-a套个负号就知道为什么了 嗨我是小斌 举人 5 因为cos(α-90)=cos(90-α) 济正堂 白丁 1 cos(α)=cos(-α)所以cos(-α+90)=cos(α-90) sinα=cos(α-90)=co...
The cosine of an angle is equal to the length of the "adjacent" side divided by the length of the "hypotenuse" of a right triangle formed by a horizontal line (called the "adjacent side"), another line (the "hypotenuse") intersecting the first line at th
Why is sec(pi)x = (1/pi)sec x? Why does e^{-\infty}=0? Why is e^pi greater than pi^e? Explain why \frac{\sin x}{x} \leq 1 for -1 \leq x \leq 1, x \neq 0 . Why are we able to transform 4x-2(x-5)=3x into 4x-2x+10?
Is either of 0 > b - x + 3 or -3 < b - x equivalent to x - b < 3? Why? Linear Inequalities: This problem involves solving and rearranging inequalities in different ways. Note the idea used is that, upon adding any real number to both sides of ...
the given range for x is fine for the 1st two but not for (c) "arcsin" is misspelled as arccsin. what other carelessness is there? ask your teacher for a model answer - showing working. I truly agree with you sir. That's why I rather choose to drop all my subjec...
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The Usa is like a 1000 watt bulb burns bright but uses alot of resources is all but burnt out. Inflation now threatens the existence of the people around the world. The golden 1 billion people who live in countries with massive natural resources will be the chosen people to survive. ...
The sine function results in a value from +1 to –1. First set t equal to a constant—say, 1. The argument, ωt, is now no longer a function of time. With ω in radians, the sin of π/4 is approximately 0.7071. 2π radians equals 360°, so π/4 radians correspond to 45°....
Answer to: Why is the sum of the maximum voltages across each of the elements in a series RLC circuit usually greater than the maximum applied...
If object is naive it is presumed to be in system's timezone. from datetime import date, time, datetime, timedelta from dateutil.tz import UTC, tzlocal, gettz Constructors <D> = date(year, month, day) <T> = time(hour=0, minute=0, second=0, microsecond=0, tzinfo=None, fold=0...