Math, asked by thanmaibuddi, 7 months ago

c) 2 cos 78º. sin 42°

Answers

Answered by PawaniVashishth

0

Answer:

Step-by-step explanation:

ANSWER

sin78

∘

−sin66

∘

−sin42

∘

+sin6

∘

=(sin78

∘

−sin42

∘

)+(sin6

∘

−sin66

∘

)

=2sin18cos60+2sin(−30)cos36

=sin18−cos36

=

4

5

−1

−

4

5

+1

=−

2

1

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