Tanα=−2,π2 < α < π and cotβ=−2, 3π2 < β<2π

sin(α+β)=
cos(α-β)=
tan(α+β)=

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the answer for this question is a= 13,622.84

step-by-step explanation:

the correct answer option is d. la = πrs.

step-by-step explanation:

we know that for a right cone, the lateral surface area is given by:

lateral area of right cone =

here the value under the square root is equal to slant height so replacing this value by in the formula to get:

lateral area of right cone =

therefore, the correct answer option is d.