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question mark

how to find values like sin38 ,cos43 etc
show the methods clearly

gyaneesh , 7 Years ago
Grade 11
anser 1 Answers
Aashna
There will never be a question to find the values..
It can be done by either splitting the number or using their complement.. The chart given below will help u..
Sin (90-A)= CosA
Cos (90-A)=SinA
Tan (90-A)=CotA
Cot (90-A)=TanA
Sec (90-A)=cosecA
Cosec (90-A)=sec. 
For eg.. Q_ Sin(A+B)=SinA. CosB+cosA+sinB. Find sin75..
[We have to split the no. So that the two numbers we got will be out of our trigonometric table (0,30,45,60,90)..]
SI accoring to above.. 75 can be written as 30+45..
Let A=30,B=45
Now substitute the value in d given eq:
Sin (30+45)=Sin30.cos45+cos30.sin45..
Now we can substitute d values..and can find d value. 
Which will be 1+root3 /2 root2.
Hope it helped and solved ur query.
Last Activity: 7 Years ago
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