sin 34° cos 236 - sin 56° sin 124°/
cos 28° cos 88° + cos 178° sin 208°
?
(a) -2
(b) - 1
(c) 2
(d) 1
Answers
Answered by
6
Answer:
-2
Step-by-step explanation:
given.
sin 34°cos236 - sin56°sin124°/
cos28°cos88°+cos178°sin208°
cos 136 =cos ( 180+36) = -cos56
sin124= sin(90+3) = cos34
cos178 = cos (90+88) = -sin88
sin208= sin (180+28) = -sin28
sin34(-cos56)-sin56cos34
cos28 cos88 -(sin88) (-sin28)
-sin34 cos56 - cos34 sin56
cos88 cos28 + sin88 sin28
-(sin34 cos56 + cos34 sin56)
cos88 cos28 + sin88 sin 28
-sin(34+56)
cos(88-28)
-sin90
cos60
-1
1/2
-2 ans
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