Question

cos 260 cos 40
Sin 260
sin 40​

Answer 1

I think sin 40° = 0.68 something cos 40° 0.977 something

Answer 2

Answer:

Step-by-step explanation:

cos 260 cos 40 sin 260 sin 40

=cos(270-10) cos(90-50)sin(270-10)sin(90-50)

=-sin 10 sin 50 -cos 10 cos 50

= sin 10 sin 50 cos 10 cos 50

hope you understand

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