Q) cos x*tan x=3/5, find sec x??
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........ the...........
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sin2(x)=tan2(x)tan2(x)+1 ⇒ sin(x)=tan(x)√tan 2(x)+1. So, plugging this ... We can now use this to find cos(x) : ... 25144+1=sec2(x)=169 144. Thus: ... ∈Q3and=kπ+arctan(512),k=1.3,5 ,.
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