cos( -x)=-cosx if x=90 then cos( - x) = cos 90 then how it is equal to - - Maths - Trigonometric Functions

Question

cos(?-x)=-cosx if x=90 then cos(?- x) = cos 90 then how it is equal
to - cos 90 plz explain ?

Varun Rawat · Accepted Answer

Dear Student,

Your question is unclear, kindly recheck it and do get back to
us

Regards

cos(?-x)=-cosx.. if x=90 then cos(?- x) = cos 90 then how it is equal to - cos 90 ..plz explain..?