Answers edited by Alex

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• How do you multiply #e^(( 5 pi )/ 4 i) * e^( 3 pi/2 i ) # in trigonometric form?
  
• If #cos(t)=-7/8# with #pi<=t<=3pi/2#, how do you find the value of #cos(t/2)#?
  
• How do you find the equation of a line tangent to the function #y=(x-2)(x^2+1)# at x=-1?
  
• F(t)=sec pi t/4?