Question

State the sign of the following
tan 380 and cos 820​

Answer 1

$i ) tan \: 380\degree \\= tan ( 360 + 20 )\\= tan 20 \\ = Lies \: in \: first \: Quadrant \\= Positive \:sign$

$ii ) cos \: 820\degree \\= cos ( 2\times 360 + 100 )\\= cos 100 \\ = Lies \: in \: second \: Quadrant \\= Negative \:sign$

Therefore.,

$\red { Sign\: of \: tan \:380\degree } \green {\: Positive }$

$\red { Sign\: of \: cos\:820\degree } \green {\: Negative}$

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Answer 2

Answer:

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