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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 Rs...

Answered by Jacob R. • Maths tutor

4873 Views

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 l...

Answered by Ines O. • Classical Civilisation tutor

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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.Pro...

Answered by Ines O. • Psychology tutor

4476 Views

¿Crees que es mejor casarse o vivir juntos sin casarse?

This is an example of a question that may be asked in a speaking exam. It asks whether it's better to be married or live with someone without getting married. I would help the student answer the question ...

Answered by Ines O. • Spanish tutor

2387 Views

3/5 of a number is 162. Work out the number.

Something multiply 3/5 = 162Think of this something as a piece of cake. Now this cake has been equally sliced into 5 pieces. 3 pieces of the cake is worth 162 (let's give it a value, pound, dollar, or any...

Answered by Han K. • Maths tutor

4042 Views