Question

1-tan square 30 /1+tan square 30​

Answer 1

cos2x= 1-tan^2x/1+tan^2x

cos60°= 1/2

Answer 2

From trigonometric table we have :

tan(30) = 1/√3

$(1 - {(1 \div \sqrt{3}) }^{2} ) \div {(1 + (1 \div \sqrt{3}) )}^{2}$

= 3-1/3+1

= 1/2.

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