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IMPORTANTTT

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Saladin:
For the first Question:

The answer is (e). basically means that the value is a negative version of cos(). Because up till the values for cos are positive, as it is in the ALL quadrant. However, this does not lie in that quadrant, so it is negative version of .

For the second question:

The only answer is (c).





or (I like working in degrees)

Remembering the sin wave, by making the equation , you put two sin waves into the 0 to 360 gap. Therefore, where 360 degrees was, that position is 180 degrees. Therefore, if we repeat the wave, we repeat the values. Therefore degrees is also an answer.

So, the two answers are:

and

The working without the explanation is as follows:



 

 

Therefore, and

45 degrees is equal to radians and 225 degrees is equal to

Hope this clears all doubts.

halosh92:

--- Quote from: Engraved on August 08, 2010, 09:10:16 pm ---For the first Question:

The answer is (e). basically means that the value is a negative version of cos(). Because up till the values for cos are positive, as it is in the ALL quadrant. However, this does not lie in that quadrant, so it is negative version of .

For the second question:

The only answer is (c).





or (I like working in degrees)

Remembering the sin wave, by making the equation , you put two sin waves into the 0 to 360 gap. Therefore, where 360 degrees was, that position is 180 degrees. Therefore, if we repeat the wave, we repeat the values. Therefore degrees is also an answer.

So, the two answers are:

and

The working without the explanation is as follows:



 

 

Therefore, and

45 degrees is equal to radians and 225 degrees is equal to

Hope this clears all doubts.

--- End quote ---

thankyouuuu yes very clear :D

Saladin:

--- Quote from: halosh92 on August 09, 2010, 06:07:19 am ---thankyouuuu yes very clear :D

--- End quote ---

Glad to be of service! :)

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