If `tan 50^@-tan 40^@=k tan 10^@` then the value of k is

If tan 69^(@) + tan 66^@ - tan 69^(@) tan66^@=2k , then the value of k is

tan50^(@)-2tan10^(@)=

If cos x= tan 40^@ tan 50^@ , what is the value of x ?

Show that tan50^@=tan40^@+2tan10^@

Show that : tan 50^@=tan 40^@+2tan 10^@ .

tan10^(@)-tan50^(@)+tan70^(@)

If tan(x + 40)^(@)tan(x+20)^(@)tan(3x)^(@)tan(70 - x)^(@)tan(50-x)^(@)= 1 , then the value of x is equal to

Evaluate tan 40^@ xx tan 50^@

Evaluate tan 40^@ xx tan 50^@

Evaluate tan 40^@ xx tan 50^@