find the exact value of the expression. do not use a calculator
sin (-4pi) + cos (2pi)

Question

find the exact value of the expression. do not use a calculator 
sin (-4pi) + cos (2pi)

anonymous · Answer

well do you know the unit circle?

princeharryyy · Answer

welll d answer is 1 sin(2*2pi) = 0 and cos2pi = cos0 =1, and so the answer is 0 + 1 =1

princeharryyy · Answer

@lonakkkk

anonymous · Answer

@tejasvir is his method correct i would say im familiar with it and thanks @princeharryyy are u 100 percent sure

anonymous · Answer

i would say its -1

anonymous · Answer

can i ask why?

anonymous · Answer

@tejasvir

princeharryyy · Answer

yes I am @lonakkkk

princeharryyy · Answer

these two function sure periodic 100% sure . check by plugging in your answers

princeharryyy · Answer

1 is d answer

anonymous · Answer

will you help me with the new one i just posted and explain it to me @princeharryyy

triciaal · Answer

sin(2*2pi)  are you sure this is the same as (-2*2pi) the original had (-4pi)

princeharryyy · Answer

yup it does not matter whether it is -4pi or 4pie whenever it is a product of an integer and pie in case of sin it is always zero (but, remember integer not the fraction) @triciaal