Question

what is the value of cos33°59'. cos26°1 - sin33°59'. sin26°1'​

Answer 1

Answer:

cos 60°=1/2

Step-by-step explanation:

cos33°59'. cos26°1 - sin33°59'. sin26°1'​

we know that :

cosAcosB-sinAsinB

=cos(A+B)

cos33°59'. cos26°1 - sin33°59'. sin26°1'​

=cos (33°59'+26°1')

=cos { ( 33°+26°) (59'+1') }

=cos (59°+60')

=cos(59°+1°) ( As 60'=1°)

=cos 60°=1/2