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could you give some points about trig. I am always confused with trig about how to calculate cos46, tan32, sin54 withot a calculator..... could you pls clear this doubt

ashutosh anand , 11 Years ago
Grade 8
anser 1 Answers
Arun Kumar

Last Activity: 11 Years ago

Hello Student,
Try relating them with common values
sin0,30,45,60,90
for eg for sin15 use sin30 value
for sin54 we do like this
90-2*18=3*18
so
sin2*18=sin3*18
using sin2A and sin3A we can find sin18
then again we get sin3*18 by sin3A
similary cos36=sin54
Thanks & Regards
Arun Kumar
Btech, IIT Delhi
Askiitians Faculty

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