sin5x-2sin3x+sinx/cos5x-cosx=tanx
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
sin5x + sinx = 2sin3x cos2x\xa0cos5x – cosx = -2sin3x sin2x ….. use factorisation formulae of trigonometry.\xa0So the fraction is 2sin3x(cos2x-1)/ – 2sin3xsin2x\xa0= (1- cos2x)/sin2x\xa0= 2(sin2x)/ 2sinxcosx\xa0=sinx/cosx\xa0=tanx.