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Express 6sin(2x)+5cos(x) in the form Rsin(x+a) (0degrees<x<90degrees)

Expand sin(2x) to 2sin(x)cos(x) so you have 6(2sin(x)cos(x))sec(x). cos(x) and sec(x) cancel out so the expression becomes 12sin(x) + 5cos(x). compare this to the expanded version of Rsin(x+a) which is Rsin(...
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Answered by Jacob R. • Maths tutor
5340 Views

Analyse which was the most prominent form of conflict between the Soviet Union and United States during the Cold War

The student should adress these 3 main forms: Traditional Great Power Rivalry (using the establishment of sphere's of influence at the Yalta and Tehran conferences as well as Soviet fears of invasion post-wa...
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Answered by Alexander M. • History tutor
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Describe the events after the Battle of Gaugamela that led to Darius’ murder. Make five points.

Darius had fled from the battle of Gaugamela and been pursued by Alexander and his Companions until he had to return to help Parmenio in the battle. Alexander lost him and continued to Babylon. Later he lear...
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2040 Views

Solve the simultaneous equations: 1) 3x+5y=14 and 2) -3y+10=x

Multiple the second equation through by 3 so that the x is multiplied by the same number in both equations. -&gt; -9y + 30 = 3x 2) Rearrange the equation so that the x and y are both on the same side. -&gt; ...
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Answered by Gabrielle S. • Maths tutor
4709 Views

A psychologist decided to interview both Zina and Amanda five months later to see if they could still remember the same level of detail about the incident. Explain one ethical issue the psychologist must consider before interviewing Zina and Amanda.

Some example answers include:Confidentiality - People should be treated with respect. They should be reassured that their answers will be confidential. Also, they should be given the right to withdraw.Protec...
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Answered by Ines O. • Psychology tutor
4738 Views