Qualification > Math

c2 DOUBT

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Saladin:


Therefore,

This can also mean that is and .

Thus, the only answer that is between 0 and 360 is .

Saladin:
Please note that arctan is just tan^-1

halosh92:

--- Quote from: Mr. Enigmatic on April 30, 2010, 04:30:51 pm ---Please note that arctan is just tan^-1

--- End quote ---

its 90 and 270 actually
thx but  ;)

halosh92:
cos(50 + 2 thita)=-1

??? how to find thita?

Saladin:
The answer is 65 and 245.

Work out the value of

Then you get 180.

So,

Now you get

Now, just do , because you want a negative value. Cos will be negative in this quadrant.

And u get

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