Question

please answer me fast solve Q.-17,18​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

18) i) Cos2A= cos^2 A-sin^2 A

Cos2(30)= cos^2 30 - sin^2 30

cos60 = (√3/2)^2 - (1/2)^2

1/2 = 3/4 - 1/4

1/2 = 3-1/4

1/2 = 1/2

LHS = RHS