Taykeya Taykeya

08-10-2016
Mathematics

Answered

Sin205Cos85-Cos205Sin85

Verified Answer :

Jimmy1999 Jimmy1999

09-10-2016

Remember that :

sin a . cos b - cos a. sin b = sin (a-b)

so :

sin 205. cos 85 - cos 205 . sin 85
= sin (205 - 85)
= sin 120
= sin ( 180-60)
= sin 60
= ½ √3

Hopefully helpfull... :)

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