Question

determine that each equation is an identity.

cosBcotB=cscB-sinB

Answer 1

hint : convert cotB=cosB/sinB

Answer 2

i tried that....
it got really confusing

Answer 3

ok, we start from left side to prove equal to right side
cosBcotB = cosB*cosB/sinB
= cos^2 B / sinB
= (1-sin^2 B) / sinB
= 1/sinB - sin^2 B/sinB
= cscB - sinB

Answer 4

thank you so much! this lesson makes no sense... :'(

Answer 5

yea i forgot tell u that cos^2 B = 1-sin^2 B,
sorry :)