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Mathematics: Post your doubts here!

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Plzzz show me the mthod and if possible attach a scan!!the best thing....:)would appreciate!!
 

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I am appearing for ALEVELS maths in oct/nov. 2012 session. I think this site is useful, for queries. Who else among U are giving same subject in oct/nov. session?? please reply????
 
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for the 2nd question,
just change the (sin3x sinx) inside the integration to (1/2)(cos2x-cos4x),
then intergrate it,
and put the corresponding value into x,
you will get the answer.
hey bro why cant I use sin3xsinx and then integrate??i can right?
 
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