Question

Evaluate.......


${\textbf{Subject : Mathematics}}$

${\textbf{Chapter : Trigonometric Functions }}$


Class 11th.
​

Answer 1

sin390 × cos 120

sin( 360+30) × cos(180-60)

sin30 × - cos60

1/2 × -1/2

-1/4

Answer 2

ஜ۩۞۩ஜ[ welcome to the concept of Trigonometry ]ஜ۩۞۩ஜ

sin 390° × cos 120°

= sin ( 4×90+30)× cos (90+30)

= sin 30×( -sin30)

= -1/4

= -0.25

✨I hope it help you ❤️