1003076512 Level: BThe value of sin(−53π6) is the same as the value ofsin7π6.sinπ6.sin5π6.sin(−11π6).
1003076513 Level: BIf two of the values of sinα, cosα, tgα and cotgα are negative, then α belongs to the interval(π;3π2).(0;π2).(π2;π).(3π2;2π).
1003076601 Level: BHow many x-intercepts has the graph of the function f(x)=cos2x on the interval [−π;2π]?6453