Math, asked by lakshya456, 11 months ago

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 shalinisehgal650
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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