Questions asked by Fun B.

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• 1.#cos^2(π/24)+cos^2((19π)/24)+cos^2((31π)/24)+cos^2((37π)/24)= #? solve this
  
• 1.sin780.cos390+sin(-390).cos(-300)=?
  
• # Sin^2(π/12)+sin^2(3π/12)+sin^2(5π/12)+sin^2(7π/12)+sin^2(9π/12)+sin^2(11π/12)=? #
  
• # Sin^2(π/12)+sin^2(3π)/(12)+sin^2(5π)/(12)+sin^2(7π)/(12)+sin^2(9π)/(12)+sin^2(11π)/(12)=? #
  
• #"cosec"((nπ)/2+(-1)^n π/6)# is equal to? where #n in ZZ#
  
• # sin(-1230)-cos{(2n+1)π+π/3}=? #