60Upper Secondary Big Buttonhttp://nrich.maths.org/secondary-upperen 2012 http://nrich.maths.org/public/terms.phpMixed BagA collection of intriguing questions involving logarithms.http://nrich.maths.org/12382Wed, 01 Dec 1999 00:00:01 +0000Trig TablesCan you fill in all the missing values and trig functions to make the tables complete? <a href="https://undergroundmathematics.org/trigonometry-triangles-to-functions/trig-tables"></a>http://nrich.maths.org/12381Wed, 01 Dec 1999 00:00:01 +0000ComposeCan you compose four functions to create the set of functions given? <a href="https://undergroundmathematics.org/combining-functions/compose"></a>http://nrich.maths.org/12380Wed, 01 Dec 1999 00:00:01 +0000Two-way CalculusCan you find functions with the desired properties to fill in the table? <a href="https://undergroundmathematics.org/calculus-meets-functions/two-way-calculus"></a>http://nrich.maths.org/12379Wed, 01 Dec 1999 00:00:01 +0000Pick 'n' Mixhttp://nrich.maths.org/12376Wed, 01 Dec 1999 00:00:01 +0000Underground Mathematics - Share Your SolutionsHere's how you can send in your solutions to these Underground Mathematics problems.http://nrich.maths.org/12349Wed, 01 Dec 1999 00:00:01 +0000$t$ for tanCan you find a geometric proof for some $\tan\theta$ trig identities?http://nrich.maths.org/12148Thu, 01 Jan 2015 00:00:01 +0000Proving Half-angle FormulaeCan you find a geometric proof of these half-angle trig identities?http://nrich.maths.org/12147Thu, 01 Jan 2015 00:00:01 +0000Inspecting IdentitiesUsing trig identities to help sketch graphs of functionshttp://nrich.maths.org/12146Thu, 01 Jan 2015 00:00:01 +0000Trig CountdownA game for one or more players in which you make a target value by building a trig expressionhttp://nrich.maths.org/12145Thu, 01 Jan 2015 00:00:01 +0000Paired ParabolasSome parabolas are related to others. How are their equations and graphs connected?http://nrich.maths.org/11924Wed, 01 Dec 1999 00:00:01 +0000Which Fraction Is Bigger?Given two algebraic fractions, how can you decide when each is bigger?http://nrich.maths.org/11923Wed, 01 Dec 1999 00:00:01 +0000Name That GraphHow can you work out the equation of a parabola just by looking at key features of its graph?http://nrich.maths.org/11922Wed, 01 Dec 1999 00:00:01 +0000BetweenIf you know some points on a line, can you work out other points in between?http://nrich.maths.org/11921Wed, 01 Dec 1999 00:00:01 +0000Can You Traverse It?How can you decide if a graph is traversable?http://nrich.maths.org/11826Wed, 01 Dec 1999 00:00:01 +0000Connecting the UtilitiesCan you find a way to connect each house to the utilities without any pipes crossing?http://nrich.maths.org/11825Wed, 01 Dec 1999 00:00:01 +0000Who's Who?Can you solve the clues to find out who's who on the friendship graph?http://nrich.maths.org/11821Wed, 01 Dec 1999 00:00:01 +0000Designing a PolynomialCan you find a polynomial function whose first derivative is equal to the function?http://nrich.maths.org/11740Mon, 01 Jun 2015 00:00:01 +0100Curvy CubicsUse some calculus clues to pin down an equation of a cubic graph.http://nrich.maths.org/11739Mon, 01 Jun 2015 00:00:01 +0100Integral ChasingCan you find the missing constants from these not-quite-so-obvious definite integrals?http://nrich.maths.org/11738Mon, 01 Jun 2015 00:00:01 +0100Can You Find... Cubic CurvesCan you find equations for cubic curves that have specific features?http://nrich.maths.org/11737Mon, 01 Jun 2015 00:00:01 +0100Truth Tables and Electronic CircuitsInvestigate circuits and record your findings in this simple introduction to truth tables and logic.http://nrich.maths.org/6025Tue, 01 Feb 2011 00:00:01 +0000Circuit MakerInvestigate how logic gates work in circuits.http://nrich.maths.org/5974Tue, 01 Feb 2011 00:00:01 +0000Simple Counting MachineCan you set the logic gates so that the number of bulbs which are on is the same as the number of switches which are on?http://nrich.maths.org/5973Tue, 01 Feb 2011 00:00:01 +0000Adding MachineCan you set the logic gates so that this machine can decide how many bulbs have been switched on?http://nrich.maths.org/5931Tue, 01 Feb 2011 00:00:01 +0000Euler's FormulaSome simple ideas about graph theory with a discussion of a proof
of Euler's formula relating the numbers of vertces, edges and faces
of a graph.http://nrich.maths.org/4719Tue, 01 Feb 2011 00:00:01 +0000