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cot (90-theta )tan theta -cosec(90-theta)sec theta/sin12 cos15 sec 78 cosec 75+cos2(50+theta)+cos2(40-theta)/tan 15 tan 37tan 53 tan75
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If tan theta=dfrac {cos 9^ {o}+sin 9^ {o}}{cos 9^ {o}-sin 9^ {o
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In the right triangle ABC having C= 90 degrees, b = x and c = 5x
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