3 years ago

(Prove that):2 sin 70. cos 20 = sin 90 + sin 50

Mathematics

1 answer:

Sphinxa [80]3 years ago

5 0

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identity

2sinxcosy = sin(x + y) + sin(x - y) , then

with x = 70 and y = 20

2sin70cos20

= sin(70 + 20) + sin(70 - 20)

= sin90 + sin50

= right side , thus proven

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(Prove that):2 sin 70. cos 20 = sin 90 + sin 50​

(Prove that):2 sin 70. cos 20 = sin 90 + sin 50