The cosecant is the reciprocal of the sine. The cotangent is the reciprocal of the tangent. The secant is the reciprocal of the cosine. If you have sin x = 3/5, then csc x = 5/3.
The actual fuel used by the IRL is a blend of about 98 percent ethanol and 2 percent denaturant. The exact composition includes a small amount of high-octane racing fuel. The fuel for today's Indy cars has an octane rating of 113, compared with methanol's 107. This means a significant reduction in pre-ignition, or knocking and pinging. In addition, many of the people who handle the fuel, say it smells like tequila.
Long-life plugs are manufactured with Platinum or Iridium. Most new cars come with long-life plugs. With the average age of a vehicle on the road today now exceeding 11 years, long-life plugs many of them may not have had long-life spark plugs installed, so if your car is older, you may need to replace yours far sooner.