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Question

If tanθ=43, what is the value of cosθ?
  1. 0.6


Solution

The correct option is A 0.6
We know
sec2θtan2θ=1sec2θ=1+tan2θsecθ=1+tan2θsecθ=1+(43)2secθ=9+169secθ=259secθ=53cosθ=35=0.6
 

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