Question

Find the value of Cosec(11π/4)

Answer 1

Answer:

√2

2

Step-by-step explanation:

First we have to notice, that  

11 π /4 > 2 π ,

so we can use this to reduce the angle, because  cos ( 2 π + x )

= cos ( x )

After this reduction we have to calculate  

cos ( 3 π 4 )

. To do this we use the reduction formula:

cos ( π −π 4 )

= − cos ( π 4 )

=  √ 2  

  2

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Answer 2

Answer:

Step-by-step explanation: