Question

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Answer 1

24)a1/a2=b1/b2 (unique solution)

3/6=-2/k

1/2=-2/k

1×k=2×-2

k=-4

25)tan85 tan65 tan45 tan25 tan5

tan(90-5)tan(90-25)tan45 tan25 tan5

cot5 cot25 tan45 tan25 tan5

1/tan5 × 1/tan25 tan45 tan25 tan5

tan45 =1

26)sin18=cos x

sin(90-72)=cosx

cos72=cosx

value of x=72

27)√(secA-1)(secA+1)

√(sec squareA-1)

√tan squareA

tanA