Question

4 ( sin^430° cos^460°) -3 ( cos^245°-sin^290°) find the value


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Answer 1

Step-by-step explanation:

Solution

sin30

0

=

2

1

⇒sin

4

30

0

=

16

1

cos60

0

=

2

1

⇒cos

4

60

0

=

16

1

cos45

0

=

2

1

sin

2

90

0

=1

⇒4(

16

1

+

16

1

)−3(

2

1

−1)

⇒

2

1

−

2

−3

=2