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Q.

If tan35°=k , then the value of tan145°tan125°1+tan145°tan125°=

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a

2k1+k2

b

2k1k2

c

1k22k

d

1k21+k2

answer is C.

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Detailed Solution

tan35=k

tan145=tan(18035)

=tan35

=k

tan125=tan(90+35)

=cot35

=1k

tan145tan1251+tan145.tan125=k+1k1+(k)(1k)=1k22(k)

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If tan35°=k , then the value of tan145°−tan125°1+tan145°tan125°=