Question

PART
MATHEMATICS - VIII PART-I
TRIGONOMETRY
1.
CHALLENGERS
Find the values of the following:
i) cos 585°
ii) tan 480°
iii) sec 510°
iv) tan (-300°)
5a
ST
-200
v) cosec 7500
vi) sin (ST)
vii) tan (-20%)
vii) tan
vii) cos( 57 )
vi) sin
v) cosec 750°
viii) cos
$cos5\pi \: by3$
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Answer 1

Answer:

sorry, I am also in class 8th but can't able to answer.

Answer 2

Answer:

For question no 1 answer is - .707 ,

we can write cos 585 as cos (6*90 +45)=-cos 45

for 2nd question the answer is : - 1.732

we can write tan 480 as tan ( 5*90+30)= -cot 30

for 3rd question the answer is: -1.154

we can write sec510 as sec(5*90+60)=-cosec 60

for question 4 the answer is : 1.732

we can write tan (-300)as -tan 300 and then -tan(4*90-60)=tan 60