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UP Board Solutions for Class 10 Maths Chapter, 8 Quadratic Equations, , tan 26°, , cot 64°, , sin If, , @ 750 (ii), , (iii) cos 48° -sin 42 (iv) cosec 31°—sec 59, cos 7, , . frareu fr, (i) tan 48° tan 23° tan 42° tan 67° = 1, , (ii) cos 38° cos 52° — sin 38° sin 52° =0, , . AAS tan 2A = cot (A— 18°), Hel 2A UH AA SM Z, a A FAA ad Sia, , . aR tan A=cot B, a fas ifm fRA+B=90, , . AAT sec 4A =cosec (A—20°), Hel 4A Wa BA HM Z, aA Hl AM ae Sisal, . a ALB SR CRYMABC S Ha-a™ Si, a frau fH, , (B+C, |, 5, , sin 67° +.cos 75° Hl O° AK 45° & ata & BH SH MMs saga & ye A aT, , sin 18°, , cos 72°, , sin 18°, , cos 72°, , ie sin (90°—A) = cosA, , ak sin 18° sin (90° ~ 72°), , 2 sin (90° — 72°) cos 72° + sin 18° =‘cos 72°, sin 18° cos sin 18° _ 1, , aa, ~ =1 790, cos 72° cos 72° cos 72, , (iii) cos 48° - sin 42° (iv) cosec 31° - sec 59°, , (ii) tan 26°, u, cot 64°, wa ura @: tan 26° = tan (90° — 64°) = cot 64° [tan (90° - A) = cot A], tan 26° _ cot 64°_, _ tan 26° _, , cot 64° cot 64 cot 64, , (iii), cos 48° - Sing42°, , ic pool: hertYa, =>sin(90° -,48°) - sin 42°, Soe) Yael Yam, , (iv) cosec 31° - sec 59°, Bet: cosec 31° - sec 59°, => sec (90° - 31°) - sec 59° [ cosec q = sec (90° - q) ], => sec 59° - sec 59°= 0, , FOR VIDEO SOLUTION CLICK HERE AND FOR MORE SOLUTION PLEASE SUBSCRIBE OUR CHANNEL