First slide
Trigonometric equations
Question

Number of roots of the equation sinxcosx+2+tan2x+cot2x =3, x0,4π is 

Easy
Solution

sinxcosx+tanx+cotx=3 sinxcosx+1sinxcosx=3 But sinxcosx+1sinxcosx 2 Hence, no solution. ie; the number of real solutions is zero.

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