sec 70° sin 20° - cos 20° cosec 70º = 0
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Answer:
hence proved
sec 70° sin 20° - cos 20° cosec 70º = 0
Step-by-step explanation:
secx is 1/cosx
cos(90-x) =sin x
sin20/sin20 =1
cosecx =1/sinx
sin(90-x) = cosx
cos20/cos20 =1
therefore 1-1=0
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