1.

Integrating factor of differential equation `cosx(dy)/(dx)+ysinx=1`is(a)`( b ) (c)cosx (d)`(e)(b) `( f ) (g)tanx (h)`(i)(c)`( d ) (e)secx (f)`(g)(d) `( h ) (i)sinx (j)`(k)A. `sin x`B. `sec x`C. `tan x`D. `cos x`

Answer» Correct Answer - B
We have,
`(dy)/(dx)+(tanx)y=secx`
`therefore" I.F. "=e^(int tan x dx)=e^(log secx)=sec x`


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