Q31 of 123 Page 9

If then find the value of




On taking LCM:





Dividing numerator and denominator by a:








{∵ (a + b)(a – b) = a2 – b2}



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30

If and x is acute, find tan 2x.

 30

If and find the value of sin 4x.

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If and show that cos 2A = sin 4B

 33

Prove that: