Math, asked by Billina, 1 year ago

cos(3π÷4+x)-cos(3π÷4-x)=√2sin x
plz prove this.

Answers

Answered by sandy1816

1

Step-by-step explanation:

cos(3Π÷4+x)-cos(3Π÷4-x)

=-2(sin3Π÷4+x+3Π÷4-x/2)sin (3Π÷4+x-3Π÷4-x/2)

=-2sin 3Π÷4 sinx

=-2.1/√2 sinx [sin 3Π÷4=1/√2]

=-√2 sinx

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