OpenStudy (anonymous):

Find the exact value of (sin7.5cos7.5)(sin7.5+cos7.5)(sin7.5-cos7.5)(tan7.5)(cot7.5)

5 years ago
OpenStudy (anonymous):

This is in degrees

5 years ago
OpenStudy (anonymous):

it is -1/8 i think

5 years ago
OpenStudy (anonymous):

It is, but I don't know how to get there

5 years ago
OpenStudy (anonymous):

yes here are steps (sin7.5cos7.5)it is (sin15)/2 then (sin7.5+cos7.5)(sin7.5-cos7.5)=-cos15 then tanxcotx=1 so at last u get -(sin15.cos15)/2 then it is -(sin30)/4 which is equal to -1/8

5 years ago
OpenStudy (anonymous):

hope u get it cleared @MrFrizzy

5 years ago
OpenStudy (anonymous):

Where did you get the 4 from in -(sin30)/4??

5 years ago
OpenStudy (anonymous):

it simply sinxcosx=(sin2x)/2

5 years ago
OpenStudy (anonymous):

Ah, I see now! Thanks!

5 years ago