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Show that: [sin(2a)] / [1+cos(2a)] = tan(a)

We start by expanding out the double trigonometric terms (sin(2a)) using the double angle formula, giving us: [2sin(a)cos(a)] / [1+cos^2(a) - sin^2(a)]. Next we spot that on the denominator (bottom half of f...
GH
Answered by George H. • Maths tutor
10104 Views

Why doesn't chlorine form hydrogen bonds even though it is more electronegative than nitrogen?

Chlorine has a higher electronegativity, but as it has a large atomic radius the electron density is spread out over a large area. This means that the electron density is too low to form proper hydrogen bond...
CL
Answered by Callum L. • Chemistry tutor
20316 Views

What does it mean when I get a negative value when I do a definite integral?

The definite integral gives the value of the area bounded between the curve at the given limits, and the x-axis (if we are integrating with respect to x!) If this value is negative, it means that the area un...
CL
Answered by Callum L. • Maths tutor
17735 Views

How can I discuss the structure of a poem?

Structure says a lot about the poets intentions of the poem, and how they wished the poem to be read. Short, sharp lines, with long continuous stanzas suggest a pace to the poem. Whereas longer lines, with l...
JW
20323 Views

How do you conjugate in present tense?

(PLEASE NOTE I WOULD PRESENT THIS IN A TABLE FORMAT DURING THE TUTOR SESSION) Yo (Me) AR= O ER= O IR= O Tú (You) AR= AS ER= ES IR= ES Él/Ella/Usted (He/ She/ You (f) / It) AR= A ER= E IR= E Nosotros/as (We) ...
JW
Answered by Jenna W. • Spanish tutor
1561 Views