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cos = base/hypotenus.

tan = prependicular/base.

cosec = reciprocal of sin.

sec = reciprocal of cos.

cot = reciprocal of tan.

cos (90*-A)=sinA

2.tan (90*-A)=cotA

cot (90*-A)=tanA

3.sec(90*-A)=cosecA

cosec(90*-A)=secA

sin2A+cos2A=1

sec2A-tan2A=1

cosec2A=1+cot2A