please answer fast I'll mark you brainliest
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Answer:
ok mark it brainlist then I will give your answer ....promise
Step-by-step explanation:
➜cos(a+b)=cos(a)cos(b)-sin(a)sin(b)
→cos(60°)cos(30°)-sin(60°)sin(30°)
→cos(60°+30°)
→cos(90°)
→0