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why is sin(x) squared plus cos(x) squared 1?

Thinking of sine and cosine as ratios of side lengths in a right angled triangle, sin(x) = o/h and cos(x) = a/h, so the sin(x)^2 + cos(x)^2 becomes (o^2 + a^2)/h^2. By Pyhtagoras, o^2 + a^2 = h^2, so we get ...
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Answered by Matthew S. • Maths tutor
23621 Views

I don't understand acceleration and how something can accelerate without speeding up.

For this we must take a step back and analyse the meaning of acceleration. Acceleration is a change in VELOCITY - this is very important. Velocity is speed in a particular DIRECTION. You may be confusing vel...
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Answered by Jana S. • Physics tutor
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Historiography is necessary to get a grade 7 in IB History but I don't understand how to include it in my essays

History is all about evaluating and critically analysing events and historical happenings. Including historiography in essays is very simple - you only need include an idea and the name of the historian or s...
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Answered by Jana S. • History tutor
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What is the Dopamine Hypothesis of Schizophrenia?

The dopamine hypothesis of schizophrenia states that symptoms may be caused by an excess of dopamine in the mid-brain and a reduction in dopamine in the prefrontal cortex. This hypothesis came from the findi...
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Answered by Rosie M. • Psychology tutor
10983 Views

Describe the conditions and processes involved in the formation of a corrie

There are physical conditions required for the formation of a glacial corrie to take place. For the processes to begin, snow must collect in a naturally occurring hollow on the side of a mountain. The hollow...
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Answered by Tara F. • Geography tutor
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