codylloyd1
codylloyd1
26-09-2016
Mathematics
contestada
cos t(sec t - cos t)
simplify the expression
Respuesta :
Аноним
Аноним
26-09-2016
Remember:
sec t=1/cos t
sin²t+cos²t=1 ⇒sin²t=1-cos² t
Therefore:
cos t(sec t- cost)=(cos t* sec t)- cos² t=(cos t * 1/cos t)-cos² t=1-cos²t=sin² t
Answer: cos t(sec t-cos t)=sin² t
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