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Hi Shubh, The easiest way would be to group cos6 with cos66 and cos42 with cos78. So cos6cos66 = (1/2)(cos72 + cos60)

Master the concepts of Trigonometric Equations including trigonometry formulas and trigonometric functions and identities with the study material for IIT-JEE by askIITians.

We help you live your dreams. Get access to our extensive online coaching courses for IIT JEE, NEET and other entrance exams with personalised online classes, lectures, study talks and test series and map your academic goals.

How can we get result of cos98 cos67 tan87 sin54 etc. Which we don`t get from tableHii you can use calculator and if it is not allowed the examination guys will

I am always confused with trig about how to calculate cos46, tan32, sin54 withot a calculator..... could you pls clear t [email protected] 1800-150-456-789

two parallel chords of a circle which are on the same side of the centre subtend angles of 72 degrees and 144 degrees respectively at the centreprove that the P

cos 43o + cos 29o - sin 11o - cos 65o is equal toa > sin 7ob > cos 36oc > sin 83od > none of thesecorrect answer - c want proper explanation Sin 11 will be equa

Master the concepts of trigonometric ratios of compound angles including trigonometry formulas, half and multiple angle formulae with the study material for IIT-JEE by askIITians.