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How do I know which trigonometric identity to use in any given situation?

For the most part, this comes down to practice. The insight in seeing which identity gives you the most efficient path to the solution comes with experience, however a little trick I like to use (silly as it...
AT
Answered by Ankush T. • Maths tutor
4167 Views

What is the tonality and harmony of Chopin's 'Raindrop' Prelude No.15 Op.28?

Tonality: Tonic key: Db major in Section A. Modulation to C# minor, the enharmonic tonic minor, in Section B. Repeat of Section A, Db major. Harmony: Mainly diatonic, with some/occasional chromaticism Use of...
JB
Answered by Jodie B. • Music tutor
6843 Views

Find values of y such that: log2(11y–3)–log2(3) –2log2(y) = 1

NB.: Treat all log as log2 for purpose of formatting log(x) - log(z) = log(x/z) alog(b) = log(b^a) log((11y - 3)/3) - log(y^2) = 1 log((11y - 3)/3y^2) = 1 11y - 3 / 3y^2 = 2^1 11y - 3 = 6y^2 6y^2 - 11y + 3 =...
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Answered by Shrinivas A. • Maths tutor
6252 Views

Describe the events that take place at the synapse that enable transmission of a nerve impulse.

An action potential arrives at the synapse, triggering Ca2+ channels to open. This in turn triggers vesicles holding neurotransmitter to fuse with the presynaptic membrane, releasing the neurotransmitter int...
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Answered by Shrinivas A. • Biology tutor
20253 Views

An electric heater has a power of 1000W. It is connected to mains electricity (230V). The heater is equipped with an Earth wire. a) Calculate the current in the heater. b) Explain the role of the earth wire as a safety feature.

a) Use the equation P=IV where P is power in W, I is Current in Amps and V is voltage in volts. Rearrange to give I=P/V I=1000/230 = 4.34 A b) This is a wire connected to the metal casing of an electrical ap...
KS
Answered by Katie S. • Physics tutor
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