1) If Cos A=2/5 then find the value of 4 + 4 tan A
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1
Answer:
cosA=(
5
2
)
∴secA=(
2
5
)
4+4tan
2
A
=4(1+tan
2
A)
=4sec
2
A
=4×(
2
5
)
2
=25
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