Question

if cot theta=21/20,then find the value of sintheta*costheta​

Answer 1

• Answer:  Step-by-step explanation:  Answer Text  cotθ=21/20  ⇒cot2θ=(21/20)2=441/400  ⇒cosec2θ−1=441/400  ⇒cosec2θ=841/400  ⇒cosecθ=29/20  ⇒sinθ=1cosecθ=20/29  ⇒cosθ=cotθ⋅sinθ=(21/20)⋅(20/29)=21/29