Find the value of cos45+cos135+cos225+cos315
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Answer:
0
Step-by-step explanation:
♧ cos45 = 1/ root2
♧ cos135 = cos(90+45)
= -sin45
= - 1/ root2
♧ Cos225 = cos(180+45)
= -cos45
= -1/root2
♧ cos315 = cos(360-45)
= cos45
= 1/root2
= 1/root2 -1/root2 -1/root2 + 1/root2
so cancelling of all it becomes zero
=0
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