i need help on this question: Find the exact value of sin 67.5 , i know that 2a is 135. and the terminal angle is 45 degree. I also need help on this, Express Pie / 2 in terms of cos A.
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Originally Posted by lickman i need help on this question: Find the exact value of sin 67.5 , i know that 2a is 135. and the terminal angle is 45 degree. [snip] . But from the double angle formula, . Therefore ....
arent they asking for sin?? the exact value of sin 67.5, so wouldnt u use Sin(2 x 67.5) = 2(1/square Root 2) (1/square root 2)
Originally Posted by lickman arent they asking for sin?? the exact value of sin 67.5, so wouldnt u use Sin(2 x 67.5) = 2(1/square Root 2) (1/square root 2) And how is that going to give you the value of sin(67.5), pray tell? Solve as I suggested.
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