Question

7
)
Show that tan20 + cot20 > 2 for all @ E R​

Answer 1

Answer:

Step-by-step explanation:

tan20/cosec70)2+(cot20/sec70)^2+2tan15tan45tan75

={tan(90-20)/cosec70}^2+{cot90-20)/sec70}^2+2(tan90-15)tan45 tan 75

=(cot70/cosec70)^2 + (tan70/sec70) ^2+ 2(cot75 tan 45 tan75 )

=(cos 70/sin70/1/sin70)^2 +(sin70/cos70/1/cos70) ^2+2(1×1)

=(cos70+sin70)^2 +2

=1+2

=3...

Answer 2

Answer:

40, 40

Step-by-step explanation:

1 pnky is dot or a period of na 2tnnnzbb